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.
"If I went into my job and I wasn't threatened on a day I would come out and go: 'Oh I mustn't have done my job today.'"
From BBC • May 13, 2026
But "we mustn't give in to this siren song," warned Bernard Jullien, an automotive industry specialist at the University of Bordeaux.
From Barron's • May 8, 2026
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
About ten minutes later the careful Hwin said, "But we mustn't go to sleep. We've got to keep ahead of that Rabadash."
From "The Horse and His Boy" by C.S. Lewis
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.
