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don't

[dohnt] /doʊnt/
verb
1.
contraction of do not.
2.
Nonstandard except in some dialects. contraction of does not.
noun
3.
don'ts, customs, rules, or regulations that forbid something:
The boss has a long list of don'ts that you had better observe if you want a promotion.
Compare do1 (def 55).
Usage note
Don't is the standard contraction for do not. As a contraction for does not, don't first appeared in writing in the latter half of the 17th century, about the same time as the first written appearance of other contracted forms with not, like mayn't and can't. Don't remained the standard contraction for does not in both speech and writing through the 18th century. During the 19th century, under pressure from those who thought it illogical and who preferred doesn't in that use, don't for does not gradually became less frequent in writing but continued to be common in speech. Don't for does not still occurs in the informal speech and in the personal writing of many Americans, including the well educated, especially in the Midland and Southern dialects. It does not occur in edited writing or formal speech.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for don'ts

don't

/dəʊnt/
contraction
1.
do not
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
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Word Origin and History for don'ts

don't

contraction of do not, recorded from 1630s.

Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for don'ts

don't

noun

Something one should not or must not do; a NO-NO: The do's and don'ts of sailing a leaky barge


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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Word Value for don

4
5
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