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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.Types of film, play, book etc.
(Definition of whodunnit from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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