April Fools' Day noun
or April Fool's Day
or April Fool's Day
Learner's definition of APRIL FOOLS' DAY
[singular]
: April 1 celebrated as a day on which people play tricks on each other愚人节 — called also All Fools' Day
◊ A trick that is played on April Fools' Day is often called an April Fools' trick or April Fools' joke.愚人节玩笑A person who is tricked on April Fools' Day is sometimes called an April fool.愚人节时受愚弄的人