Contronyms: 40 Words That Mean Their Own Opposite

There is a moment at almost every trivia night where I watch someone confidently define a word, and then another person confidently define the same word, in the opposite way. Everyone stares. Someone blames the dictionary. I usually blame English. In this case, English deserves it.

Welcome to the strange little world of contronyms (also called auto-antonyms or Janus words): words that can mean opposite things depending on context. They are not mistakes. They are not typos. They are tiny, socially acceptable linguistic trapdoors that drop you into an argument.

What is a contronym?

A contronym is a single word that carries two meanings that contradict each other. The classic examples are:

• Cleave: to split apart or to cling together
• Dust: to remove dust or to add a fine powder
• Sanction: to approve or to penalize

It is worth saying out loud: not every multi-meaning word is a contronym. English is full of perfectly innocent words with multiple senses. A contronym is the special case where those senses can point in opposite directions.

Contronyms happen for a few reasons, like:

• Historical leftovers: older meanings stick around alongside newer ones.
• Different contexts: a word in cooking, law, and everyday chat can behave like three different animals wearing the same collar.
• Shortened phrases: we drop the clarifying words and keep the confusing one.

If you enjoy language oddities like this, you will probably also like our stroll through funny oxymorons and the chaos caused by one comma.

The list: 40 contronyms

Here are 40 English contronyms. Each one comes with both meanings and a quick example so you can feel the mental gears grind in real time.

1) Cleave

• Split apart: “He cleaved the log in two.”
• Cling together: “Cleave to your principles.”

2) Dust

• Remove dust: “Dust the shelves.”
• Sprinkle powder: “Dust the cake with sugar.”

3) Sanction

• Approve: “The committee sanctioned the plan.”
• Penalize: “The country faced sanctions.”

4) Bolt

• Secure: “Bolt the door.”
• Run away suddenly: “The horse bolted.”

5) Bound

• Headed toward: “We are bound for home.”
• Tied up: “The package was bound with string.”

6) Trim

• Cut away: “Trim the hedge.”
• Decorate: “Trim the tree with ornaments.”

7) Overlook

• Fail to notice: “I overlooked the typo.”
• Look at from above: “The balcony overlooks the lake.”

8) Hold up

• Support: “These beams hold up the roof.”
• Delay: “Traffic held us up.”

9) Left

• Departed: “She left the building.”
• Remaining: “Only two cookies are left.”

10) Fast

• Quick: “A fast runner.”
• Fixed, not moving: “The rope held fast.”

11) Clip

• Attach: “Clip the tag onto the bag.”
• Cut off: “Clip the coupon.”

12) Seed

• Add seeds: “Seed the lawn.”
• Remove seeds: “Seed the peppers before cooking.”

13) Buckle

• Fasten: “Buckle your seatbelt.”
• Collapse: “The shelves buckled under the weight.”

14) Table

• Present for discussion (common in UK and Commonwealth parliamentary usage): “The minister tabled the report.”
• Postpone (common in US meeting-speak): “Let’s table this until next week.”

15) Strike

• Hit: “Strike the ball.”
• Remove or cancel: “The judge struck the testimony from the record.”

16) Screen

• Show: “They will screen the film tonight.”
• Hide or shield: “Screen the porch from bugs.”

17) Oversight

• Careful supervision: “Financial oversight.”
• Mistake from inattention: “It was an oversight.”

18) Apology

• Expression of regret: “He offered an apology.”
• Defense or justification: “She wrote an apology for the theory.”

19) Peruse

• Read carefully: “Peruse the contract before you sign.”
• Browse or skim (common modern usage, and yes, people argue about it): “I perused the menu for something fried.”

20) Give out

• Distribute: “The teacher gave out worksheets.”
• Stop working: “My knees gave out halfway up the stairs.”

21) Garnish

• Decorate food: “Garnish the soup with herbs.”
• Take money by legal order: “His wages were garnished.”

22) Enjoin

• Command or urge: “I enjoin you to be patient.”
• Legally prohibit: “The court enjoined the company from selling it.”

23) Split

• Separate: “Split the group.”
• Share: “Split the bill.”

24) Swipe

• Steal: “Someone swiped my sandwich.”
• Pass a card through a reader: “Swipe your badge.”

25) Rent

• Pay to use: “We rent an apartment.”
• Let out for payment: “They rent the apartment to students.”

26) Lease

• Let out for rent: “They leased the house to a family.”
• Take on rent: “We leased a small office.”

27) Consult

• Seek advice: “Before I signed, I consulted a lawyer.”
• Give professional advice: “She consulted on the redesign as an accessibility expert.”

28) Appropriate

• Set aside or allocate (especially money): “Parliament appropriated funds for the project.”
• Take or seize for yourself: “He appropriated the credit for the idea.”

29) Temper

• Soften or moderate: “Temper your criticism.”
• Harden (metalworking): “Temper the steel.”

30) Alight

• Get down from: “We alighted from the train at the next stop.”
• Land on: “A bird alighted on the fence.”

31) Put out

• Extinguish: “Please put out the candle.”
• Publish or produce: “The magazine put out a special issue.”

32) Resign

• Quit: “He resigned from the job.”
• Accept reluctantly: “She resigned herself to the delay.”

33) Literally

• In a strictly exact sense: “I literally wrote the words you quoted.”
• Informal hyperbolic intensifier (often used in figurative statements): “I literally died laughing.”

34) Strike out

• Fail: “He struck out in the interview.”
• Begin an attempt: “She struck out on her own.”

35) Wind up

• Finish or end: “Let’s wind up this meeting.”
• Start by winding: “Wind up the toy and watch it go.”

36) Back up

• Support: “I will back you up.”
• Move backward: “Back up the car.”

37) Toss out

• Discard: “Toss out the leftovers.”
• Suggest casually: “He tossed out an idea.”

38) Off

• Not operating: “The alarm is off.”
• Activated (set off): “Cooking set the smoke alarm off.”

39) Weather

• Withstand: “We will weather the storm.”
• Wear down by exposure: “The paint weathered in the sun.”

40) First degree

• Least severe (burns): “The doctor said it was a first-degree burn.”
• Often among the most serious (crimes, especially in many US legal systems): “He was charged with first-degree murder.”

One last thing before the language lawyers warm up their keyboards: a few entries here are phrases rather than single bare words (like hold up and strike out). They still do the same trick, just with an extra word riding shotgun.

Also, I did briefly consider repeating oversight at the end as a meta-joke, but then I remembered I live in the world, where people count things.

Why they confuse us

Contronyms are confusing because English relies heavily on context and shared assumptions. If two people are bringing different assumptions to the sentence, the word can flip like a pancake.

Take sanction. In a policy meeting, it may mean approval. In a headline, it probably means punishment. In an awkward family group chat, it might mean “please stop replying all.”

Also, some contronyms hide in plain sight because they come from different historical roots that happened to collide into one spelling. English loves a coincidence, especially one that ruins clarity.

How to use them safely

I am not here to ban contronyms. I am here to help you avoid the kind of confusion that makes people reread a sentence three times, then pretend they did not.

1) Add one clarifying word

• Instead of “We tabled it,” try “We tabled it until next week” or “We tabled it for discussion.”
• Instead of “Dust the chicken,” try “Dust the chicken with flour.”

2) Pick a less slippery synonym

• Sanction becomes “approve” or “penalize.”
• Overlook becomes “miss” or “view.”
• Peruse becomes “skim” or “study.”
• Literally becomes “actually” (if you mean it) or “honestly” / “seriously” (if you are just emphasizing).

3) Watch the danger zones

Contronyms cause the most trouble in:

• Instructions (recipes, manuals, classroom directions)
• Work writing (emails, policies, meeting notes)
• Headlines (where shortness beats clarity and everyone suffers)

If your contronym is headed for a work email, you might enjoy our guide to office-appropriate wordplay, which is basically “how to be funny without being confusing” (a noble quest).

Related word weirdness

Contronyms are their own special flavor of linguistic mischief, but they have cousins:

• Homonyms: same sound, different meaning (bat, bark, bank).
• Antonyms: different words, opposite meanings (hot and cold).
• Oxymorons: contradictory words paired on purpose (deafening silence).
• Eggcorns: charming mishearings that become “new” phrases (more on that in eggcorns vs. mondegreens).

Quick quiz

Use the sentence to decide which meaning fits. No peeking. Also, no arguing with the quiz. It is very sensitive.

1. “Please dust the brownies with cocoa.”
2. “We will table this item until next meeting.”
3. “The cabin overlooks the valley.”
4. “Only two cookies are left.”
5. “The judge struck that statement from the record.”

Answers: (1) add powder, (2) postpone (US usage), (3) view from above, (4) remaining, (5) remove or cancel.

FAQ

Are contronyms the same as Janus words?

Yes. “Janus word” is another name for contronym, referring to Janus, the two-faced Roman god of doorways, endings, and beginnings. Which is fitting, because contronyms are doorways to confusion.

Is inflammable a contronym?

Strictly speaking, inflammable means flammable. The confusion comes from people treating the “in-” like “not.” It is famous because the misunderstanding is so common and the consequences could be so unfunny.

Why does English allow this?

English is a magpie language. It borrows, blends, shortens, and reuses. Contronyms are what happens when we keep both meanings instead of politely choosing one.

What is the easiest way to avoid mix-ups?

Add one extra word of context. “Table for discussion” or “table until next week” clears things up instantly. Clarity is the cheapest magic trick you will ever learn.

One last tip

Contronyms are the reason I love language and the reason I occasionally mutter at it. If you remember just one thing, make it this: contronyms behave beautifully in context and terribly in isolation. Give them a little sentence support, and they will stop trying to start fights at your dinner table.

For more gentle language weirdness, you can wander through our Trivia guide or say hello on my author page at Colin Carmichael.