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All Fools' day

All Fools' day

2 3.1
A day on the first of April when people play jokes on others
  • noun
  • /ɔl fulz deɪ/
translation icon : Día de los Inocentes
  • April Fools' Day is a time for laughter and playful jokes among friends.
  • last All Fools' day
  • All Fools' day last year

Examples

  • On April Fools' Day, my friends and I enjoy playing tricks on each other.

  • - It's April Fools' Day.

  • Over here, on April Fools' Day... it's a custom to pin a fish on people, you know?

  • It may be All Fools' Day tomorrow, but there's no need for us to carry on as if we're, well--

  • April Fools' Day.

  • April Fools' Day.

  • Every year, I look forward to the new pranks on April Fools' Day.

Synonyms

April Fools'
vsAll Fools' day
7 2.6

A day on April 1 when people play jokes and trick others

treats it as an actively celebrated occasion rather than just noted
April Fools' Day
vsAll Fools' day
3 2.0

A day on the first of April when people play jokes on others

does not mention many countries and has no geographic emphasis

Surface Forms

Morphology

all + Fools' + day

The phrase literally combines 'all' + 'fools'' + 'day', so a B1 learner who knows the words can infer it denotes a day associated with fools or foolishness. However, the specific cultural meaning — that it is April 1st and involves playing practical jokes — is a conventional, culture-specific detail not fully predictable from the parts alone, so partial understanding but not full comprehension is likely.

Etymology

All Fools' day may come from a story about a change in the calendar: when New Year's Day moved to January 1, people who still celebrated it on April 1 were mocked as 'fools'. Because of this, others began to play tricks on them, and today the day means 'playing harmless pranks'.