whodunit

[ hoo-duhn-it ]
/ huˈdʌn ɪt /

noun Informal.

a narrative dealing with a murder or a series of murders and the detection of the criminal; detective story.

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advocate
Also especially British, who·dun·nit.

Origin of whodunit

1925–30; jocular formation from question Who done it?, for standard English Who did it?
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for whodunnit

whodunnit

whodunit

/ (huːˈdʌnɪt) /

noun

informal a novel, play, etc, concerned with a crime, usually murder
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012