The meaning of DON'T is do not. How to use don't in a sentence. Usage of Don't: Usage Guide Aug 23, 2025 · don't (plural don'ts or don't's) Among the don'ts he had done before he was twenty-one were peyote, alcohol, mescaline, and Methedrine. Look up don't, doesn't, or didn't in Wiktionary, the free dictionary. DON'T definition: 1. short form of do not: 2. short form of do not: 3. contraction of do not: . Learn more. Don't definition: contraction of do not.. See examples of DON'T used in a sentence. Define don't. don't synonyms, don't pronunciation, don't translation, English dictionary definition of don't. 1. Contraction of do not. 2. Nonstandard Contraction of does not. n. A statement of what should not be done: a list of the dos and don'ts. American 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.Cf. do1 (def. 56). Don ' t is the standard contraction for do not.