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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 trickedCheating and trickingPlotting and trapping

April fool

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