Advertisement - Continue reading below

Definition of "must" []

  • To be obliged or required by morality, law, or custom: Citizens must register in order to vote. (auxiliary-verb)
  • To be compelled, as by a physical necessity or requirement: Plants must have oxygen in order to live. (auxiliary-verb)
  • Used to express a command or admonition: You must not go there alone. You simply must be careful. (auxiliary-verb)
  • To be determined to; have as a fixed resolve: If you must leave, do it quietly. (auxiliary-verb)
  • Used to indicate inevitability or certainty: We all must die. (auxiliary-verb)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "must" in a sentence
  • "August 1, 2009 at 1:36 pm must resist……………..must………….resist."
  • "I must say, though, that most everyone around here is looking at me like we *must* be since I quit my job, all our friends are preggers or have babies and it's been two years of marriage..."
  • "You thunk it so it must be…….must be…..must be…WHAT?"