Definition of whodunit in English:

whodunit

Syllabification: who·dun·it
Pronunciation: /ho͞oˈdənit
 
/
(British whodunnit)

noun

informal
A story or play about a murder in which the identity of the murderer is not revealed until the end.
More example sentences
  • Ten strangers with secrets are brought together in a savage rainstorm in the whodunnit thriller Identity.
  • Further compounding the peril is the fact that this is basically a murder mystery, a whodunit with slasher overtones.
  • It is a whodunnit and a thriller with thrills and fun for audience and actors alike.

Origin

1930s: from who done it?, nonstandard form of who did it?.

Definition of whodunit in:

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