dunno

[duh-noh]
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Pronunciation Spelling.

don't know: Who did it? I dunno!

Origin of dunno

First recorded in 1835–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for dunno

dunno

contraction of

(I) do not know
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

Word Origin and History for dunno
v.

colloquial for "(I) don't know," first attested 1842 in American English.

Online Etymology Dictionary, © 2010 Douglas Harper