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On the off chance

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idiom / prepositional phrase

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On the off chance (idiom/ prepositional phrase): in case something unlikely happens; just in case there is a small possibility of something occurring.

This phrase is used when you do something even though you think it’s probably not going to work or unlikely to succeed, but you’re trying anyway because there’s a slim possibility it might. The word “off” here means “remote” or “unlikely”—so an “off chance” is a distant chance, a long shot, or a small probability.

People use this phrase when they’re taking action despite low expectations. It shows a combination of hope and realism—you acknowledge something probably won’t happen, but you’re doing it anyway just to cover all bases. The phrase often appears with actions like calling someone, checking somewhere, asking a question, or bringing something, all done as a precaution against an unlikely scenario.

The phrase carries a tone of cautious optimism or pragmatic preparation. It’s not quite pessimistic, but it’s definitely not confident. You’re essentially saying, “I don’t really expect this to work, but it can’t hurt to try.” This makes it perfect for situations where the cost of trying is low but the potential benefit is worth it, even if unlikely.

“On the off chance” is conversational and natural, used equally in speech and writing. It’s common in both British and American English.

Examples from the street:

• “I called the restaurant on the off chance they might have a table available” → I phoned even though I assumed they’d be fully booked, just in case they had space
• “I brought an umbrella on the off chance it might rain” → I carried it despite clear skies, because there was a small possibility of weather changing
• “I’m emailing her on the off chance she hasn’t left for vacation yet” → I’m sending the message even though she’s probably already gone, just in case she’s still around

2. Most Common Patterns

• on the off chance (that) + clause → in case an unlikely event occurs
• on the off chance of + noun/gerund → hoping for an unlikely outcome
• just on the off chance → emphasizing the action is purely precautionary
• do something on the off chance → take action despite low probability of success
• on the off chance you/he/she might… → in case someone does something unlikely

3. Idioms

Note: There are no common idioms directly containing “on the off chance” — these are related expressions:

• long shot → an attempt with very little probability of success (similar meaning to “off chance”)Example: “Applying for that job is a long shot, but I’ll try anyway.”
• just in case → as a precaution against something that might happen (similar usage but without emphasizing unlikelihood)Example: “I brought extra batteries just in case the flashlight dies.”

4. Example Sentences

1. I checked my spam folder on the off chance the email had been filtered incorrectly→ I looked in junk mail even though I thought it was unlikely, just in case it ended up there.
2. She stopped by his office on the off chance he might still be working late→ She visited despite assuming he’d already left, in case he happened to still be there.
3. I’m bringing my laptop on the off chance we need to show the presentation→ I’m carrying my computer even though it’s probably unnecessary, just to be prepared if needed.
4. He applied for the scholarship on the off chance he might qualify despite his grades→ He submitted an application even though he doubted he’d meet the requirements, hoping for a possibility.
5. We arrived early on the off chance there might be good seats still available→ We showed up ahead of time despite expecting sold-out seating, hoping to find spots.
6. I asked the manager on the off chance they could make an exception to the policy→ I inquired even though I assumed they’d refuse, just in case they might be flexible.
7. She kept her old phone on the off chance the new one might break→ She retained her previous device even though it seemed unlikely she’d need it, as a backup precaution.
8. I’m calling you on the off chance you haven’t heard the news yet→ I’m phoning despite thinking you probably already know, just in case you’re unaware.
9. They left a note on the off chance someone might find the lost wallet→ They posted a message even though recovery seemed improbable, hoping someone might discover it.
10. I checked the website again on the off chance tickets had been released→ I looked once more despite not expecting new availability, in case seats suddenly appeared.

5. Personal Examples

1. I email absent students the lesson materials on the off chance they might catch up independently→ I send class content even though I doubt they’ll study it alone, just in case they make the effort.
2. Students sometimes ask obvious questions on the off chance the answer might be different than expected→ Learners pose seemingly simple queries despite knowing the likely response, hoping to discover something new.

6. Register: Neutral / Conversational

✔ Native usage tips

• “On the off chance” clearly signals low expectations—you’re not optimistic, but trying anyway
• The phrase works well for polite requests that might be refused: “I’m asking on the off chance…”
• Can be followed by either “that + clause” or “of + noun/gerund”
• Common in both spoken and written English, from casual to semi-formal contexts

✔ Similar expressions / words

• Just in case → similar precautionary meaning, but doesn’t emphasize unlikelihood as much
• In the unlikely event that → more formal way to express the same idea
• On the chance that → less common variation meaning the same thing