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pigs might fly

pigs might fly

1 9.8
A phrase people say to show something is very unlikely to happen
  • idiom
  • Informal
: cuando las ranas críen pelo
  • He thinks he will win the lottery? That’s a classic case of pigs might fly.

Examples

  • She’ll pay you back? Pigs might fly.

  • He says he'll clean his room without being told—pigs might fly!

  • They promise this will be finished tomorrow? Pigs might fly before that happens.

  • I'll believe that when pigs might fly.

  • If he thinks he can win the lottery, he might as well believe that pigs might fly.

  • She claimed she would complete the project in a week, but we all know pigs might fly.

  • He expects to get a promotion without working hard, but pigs might fly before that happens.

Synonyms

in a million years
vspigs might fly
  • Informal
38 4.3

Saying this shows something is very unlikely to happen

expresses general extreme unlikelihood rather than time emphasis
fat chance
vspigs might fly
  • Informal
2 8.1

A way to say something is very unlikely to happen

conveys extreme unlikelihood but in a more neutral way
in dreams
vspigs might fly
  • Informal
1 7.5

Very unlikely to happen or almost impossible

states extreme unlikelihood without necessarily sarcastic tone
snowball in hell
vspigs might fly
  • Informal
9.4

An almost impossible chance of happening

says something is extremely unlikely or impossible
first of never
vspigs might fly
  • Informal
9.9

People say this to show that something will not happen

expresses extreme unlikelihood without the not again idea
to eat one's hat
vspigs might fly
  • Informal
9.1

To say you are very sure something will not happen and would do something silly if it did

expresses extreme unlikelihood without promising an action

Antonyms

∞ 1.0

Able to happen or be achieved

∞ 1.0

People expect it to happen or be true

How Likely

certain
946 1.0
likely
∞ 1.0
possible
∞ 1.0
unlikely
487 1.9
pigs might fly
  • Informal
1 9.8
impossible
∞ 1.4

Surface Forms

Morphology

pigs + may + fly

The expression's meaning (‘extremely unlikely’) is partly derivable from the constituents because, given world knowledge that pigs do not fly, a learner can infer improbability from 'pigs' + modal + 'fly'. However, the phrase is also a conventionalized idiom with a fixed pragmatic use (sarcastic dismissal) and modal nuance that may not be fully predictable to a B1 learner who has never seen it, so it is only partially transparent.

Etymology

The saying pigs might fly comes from a funny picture of pigs with wings that fly, a scene people know cannot happen. So people say pigs might fly to show they think something is 'very unlikely' or 'impossible'.