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English definition of “April fool”

April fool

noun [C usually singular] uk   us  
a trick played on someone on April Fool's Day, or the person who is tricked

April fool

exclamation uk   UK (US April fools!) us  
said on April Fool's Day when you have tricked someone
(Definition of April fool from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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