Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • Contraction of must not.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • must not; used to indicate that something is forbidden or, in a tag question, that something is not necessary.

Etymologies

must +‎ -n't (Wiktionary)

Examples

Wordnik is becoming a not-for-profit! Read our announcement here.

Comments

Log in or sign up to get involved in the conversation. It's quick and easy.