mustn't
AmericanUsage
See contraction.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
I’m sad that I mustn’t climb tall ladders anymore, per an agreement with Karen.
From The Wall Street Journal • Dec. 4, 2025
One is: We mustn’t ever get into a world where it’s got to be a genocide before we care about it.
From Slate • Nov. 20, 2025
But Oedipus’ strengths — the keenness of his mind, his heroic commitment to truth and transparency — mustn’t be overlooked.
From Los Angeles Times • Nov. 13, 2025
A motormouth book agent mustn't speak, otherwise a magical tree will die, and so will he.
From BBC • Aug. 9, 2025
“There’s no use to get all excited. You mustn’t get yourself all worked up. It’s not good for you. Sit down here on the side of the bed and try to relax.”
From "Cheaper by the Dozen" by Frank B. Gilbreth Jr. and Ernestine Gilbreth Carey
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
