Definition of “April Fool's Day” - English Dictionary

british dictionary

(Definition of “April Fool's Day” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“April Fool's Day” in American English

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April Fool's Daynoun [ C usually sing ]

also April Fools' Day us /ˈeɪ·prəl ˈfulz ˌdeɪ/

April 1, a day when people deceive others for amusement and then say, "April fool"

(Definition of “April Fool's Day” from the Cambridge Academic Content Dictionary © Cambridge University Press)