don't

[dohnt]
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 ).

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.
Cite This Source Link To don't
Collins
World English Dictionary
don't (dəʊnt)
 
contraction of
do not

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Etymonline
Word Origin & History

don't
contraction of do not, recorded from 1670s.
Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Example sentences
Don't rule out the bottom shelf, you can find good-value bulk wines there.
Make sure the location has good drainage, since you don't want water to collect
  around the frame after every rain.
Don't dare leave without trying one of these frosty, sweet, and slightly earthy
  gifts from the desert.
These branches should be well spaced along the trunk and should radiate in
  different directions so they don't shade each other.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature