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.
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
Finnish President Alexander Stubb was also quoted as saying: "We mustn't leave Ukraine and Volodymyr alone with these guys."
From BBC • Dec. 4, 2025
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
Grandpop mustn’t have responded fast enough, because Grandma barreled on.
From "As Brave As You" by Jason Reynolds
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.
