mustn't

[muhs-uh nt]

contraction of must not.

Nearby words

  1. muster,
  2. muster day,
  3. muster in,
  4. muster roll,
  5. musth,
  6. musty,
  7. mut,
  8. mut dash,
  9. mut.,
  10. mutability

Usage note


Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


Word Origin and History for mustn't

mustn't

by mid-18c., contraction of must not; see must (v).

Online Etymology Dictionary, © 2010 Douglas Harper