Definition of “April fool” - English Dictionary

“April fool” in British English

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April foolnoun [ C usually singular ]

uk /ˌeɪ.prəl ˈfuːl/ us /ˌeɪ.prəl ˈfuːl/

a trick played on someone on April Fools' Day, or the person who is tricked

April foolexclamation

uk /ˌeɪ.prəl ˈfuːl/ us /ˌeɪ.prəl ˈfuːl/ UK US April fools!

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