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


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World English Dictionary
dunno (dʌˈnəʊ, dʊ-, də-)
contraction of
(I) do not know

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Dictionary.com's 21st Century Lexicon
Main Entry:  dunno
Part of Speech:  v
Definition:  don't know
Etymology:  1840s
Usage:  casual pronunciation
Dictionary.com's 21st Century Lexicon
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Word Origin & History

colloquial for "(I) don't know," first attested 1842 in Amer.Eng.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Dunno, but their niche is filled by eg caracaras and medium-sized parrots.
Dunno was celebrant and preached tho funeral sermon.
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