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I'll be a monkey's uncle

I'll be a monkey's uncle

9.9
You say this when you are very surprised and do not believe something
  • idiom
  • Archaic
translation icon : ¡me sorprende!
  • I'll be a monkey's uncle if he actually passed the exam without studying.

Examples

  • If they finish the project on time, I'll be a monkey's uncle.

  • When she walked through the door after ten years, I thought, I'll be a monkey's uncle!

  • I'll be a monkey's uncle if they really plan to climb that mountain in winter!

  • If he claims he can speak five languages, I'll be a monkey's uncle.

  • After hearing the unbelievable news, I thought to myself, I'll be a monkey's uncle!

Synonyms

what the hell
vsI'll be a monkey's uncle
  • NSFW
347 8.9

An angry or surprised question showing you do not believe something

is focused on surprise or disbelief without the strong anger emphasis
what the heck
vsI'll be a monkey's uncle
  • Informal
90 8.9

A short cry to show surprise, confusion, disbelief, or casual acceptance

is stronger, used for bigger disbelief or shock including annoyance
say what
vsI'll be a monkey's uncle
  • Informal
68 9.8

A short phrase showing surprise and not believing what someone said

is used for surprise at unbelievable facts rather than immediate speech
what a surprise
vsI'll be a monkey's uncle
8 2.6

Words people say when they are surprised to see something

is used for hard to believe events rather than neutral astonishment
a monkey's uncle
vsI'll be a monkey's uncle
  • Archaic
9.9

An expression showing great surprise or disbelief

is used as a full exclaimed sentence showing the same disbelief
I'll be darned
vsI'll be a monkey's uncle
  • Informal
9.9

A way to say you are surprised or do not believe something

is used for surprise at something very unlikely rather than mild shock
I'll be blowed
vsI'll be a monkey's uncle
  • Archaic
9.9

An informal phrase people say to show surprise or disbelief

is the same idea but sounds more modern and common
who'da thought
vsI'll be a monkey's uncle
  • Informal
9.9

To show you are surprised something happened

focuses on disbelief at something hard to believe rather than ironic surprise
what the what
vsI'll be a monkey's uncle
  • Informal
9.9

A short phrase people say to show surprise or confusion

is aimed at disbelief about unlikely facts rather than playful confusion

How Surprised

I'll be damned
  • NSFW
31 9.9
I'll be a monkey's uncle
  • Archaic
9.9
oh
1.0

Surface Forms

Morphology

I'll + be + a + monkey's + uncle

The phrase expresses surprise or disbelief but its meaning cannot be derived from the literal parts 'be', 'monkey's', and 'uncle'—there is no transparent compositional relation between being an uncle of a monkey and expressing incredulity. This is a fixed idiomatic exclamation with historical/jocular origin, so a B1 learner who knows the individual words would not reliably predict its idiomatic meaning.

Etymology

I'll be a monkey's uncle may come from people who reacted with shock to the idea that humans are related to monkeys. Saying you'd be a monkey's uncle creates a funny, impossible picture and shows you do not believe something, so today the phrase means 'very surprised' or 'don't believe it'.