stiffen

verb

stiff·​en ˈsti-fən How to pronounce stiffen (audio)
stiffened; stiffening ˈsti-fə-niŋ How to pronounce stiffen (audio)
ˈstif-niŋ

intransitive verb

: to become stiff or stiffer
stiffener
ˈsti-fə-nər How to pronounce stiffen (audio)
ˈstif-nər
noun

Examples of stiffen in a Sentence

She stiffened when he grabbed her shoulder. The dogs stiffened in alarm. The law would stiffen penalties for tax evasion.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The light stiffens and grabs hold of us. Literary Hub, 7 Nov. 2025 But Vance Joseph's unit adjusted and stiffened quickly, shouldering the entire weight of a football game. Luca Evans, Denver Post, 7 Nov. 2025 In real materials, large angles that could create bigger matrix weights also stiffen the input path, reducing motion at the output. Jijo Malayil, Interesting Engineering, 2 Nov. 2025 Look for signs like the cat stopping purring, stiffening, thrashing their tail, or hissing. Maria Azzurra Volpe, MSNBC Newsweek, 31 Oct. 2025 See All Example Sentences for stiffen

Word History

First Known Use

15th century, in the meaning defined at transitive sense

Time Traveler
The first known use of stiffen was in the 15th century

Browse Nearby Words

Cite this Entry

“Stiffen.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/stiffen. Accessed 16 Nov. 2025.

Kids Definition

stiffen

verb
stiff·​en ˈstif-ən How to pronounce stiffen (audio)
stiffened; stiffening -(ə-)niŋ How to pronounce stiffen (audio)
: to make or become stiff or stiffer
stiffener noun

More from Merriam-Webster on stiffen

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!