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on the off chance

on the off chance

13 6.7
Just in case there is a small chance something will happen
  • idiom
: por si acaso
  • I applied for the job on the off chance that I might get an interview.
  • just on the off chance
  • on the off chance that we actually
  • on the off chance I ever

Maybe that's worth doing a little work towards it on the off chance it might be true.

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Examples

  • Still, when I'm in a new place, I do tend to leaf through the Yellow Pages in an idle moment, on the off chance that I might find listings like Metaphysicians or Cat Walkers or Husbands.

    Fiction book (1995)
  • "I went straight to Internal Affairs and told them to check it out on the off chance that some of my officers are involved."

    Fiction book (2000)
  • It's a long time to wait just on the off chance.

  • I arrived then, on the off chance it might be on time.

    Fiction book (1992)
  • But on the off chance that they are much worse, there could be an impact.

    Blog text (34)
  • So I would propose we all start working together on the off chance that some good can still come out of this nightmare.

  • You read about men; they get so obsessed with a woman that they go to restaurants on the off chance she'll be there.

    Fiction book (1995)
  • Hours earlier, they'd run out of things to say, yet neither wanted to leave the room on the off chance a rescue boat would appear.

    Fiction book (2002)
  • On the off chance that he comes back alive, then I will turn up the hem for his party.

    Fiction book (1996)
  • Maybe that's worth doing a little work towards it on the off chance it might be true.

Synonyms

slim chance
vson the off chance
10 3.4

A very small possibility that something will happen

is used when one does something because of that slight possibility
outside chance
vson the off chance
  • Informal
6 3.5

A very small possibility that something will happen

is used when someone acts because of that small unlikely possibility

Antonyms

certainty
  • Literature
202 3.4

A strong feeling that something is true or will happen

42 4.1

Says or does something in a clear and final way that leaves no doubt

How Likely

certain
946 1.0
probable
200 3.4
possible
∞ 1.0
on the off chance
13 6.7
unlikely
487 1.9
impossible
∞ 1.4

Surface Forms

Morphology

on + the + off + chance

The noun 'chance' (possibility) and the preposition 'on' (indicating occasion) are transparent, so a learner could plausibly infer the phrase relates to doing something because of a possibility. However, the use of 'off' to signal a slight or remote probability is a collocational/idiomatic choice and the fixed sequence 'on the off chance' and its nuance (slight/unlikely possibility) are not fully predictable from the parts alone, so partial inference but not full transparency applies.

Etymology

On the off chance comes from a simple image: an off chance is a small possibility sitting to one side, so you do something 'just in case' that tiny chance happens.