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English definition of “whodunnit”

whodunnit

noun [C] uk informal ( US whodunit)   /ˌhuːˈdʌn.ɪt/ us  
a story about a crime and the attempt to discover who committed it: It's one of those whodunnits where you don't find out who the murderer is till the very end.
(Definition of whodunnit from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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