contraction of do not.
Nonstandard except in some dialects. contraction of does not.
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).
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use don't in a sentence
Such I-don't-know-you behavior is the hallmark of a manager who feels vulnerable in his or her own position—or is just a jerk.
D-d-don't tell me you've finally caught Black Hood, Sergeant!
As for you, Miss Aileen Armagh-and-don't-yer-forget-it, you can't pull away from me now.Flamsted quarries | Mary E. Waller
You d-don't underthtand—I'm going to find my plathe in the world—I don't belong here.Ptomaine Street | Carolyn Wells
I d-don't think his religion struck in very deep, and it don't worry him much.Ben Comee | M. J. (Michael Joseph) Canavan
D-d-don't know how m-m-many more might be around on the other s-s-side of the house.Chums of the Camp Fire | Lawrence J. Leslie
British Dictionary definitions for don't
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