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.
Lucy’s Law, among other things, stiffens the penalties for seriously injuring someone in a boat crash. David Goodhue, Miami Herald, 9 May 2025 Posture And Mobility: Undoing The Sedentary Spiral Extended sitting does more than stiffen your spine. Ximena Araya-Fischel, Forbes.com, 19 Apr. 2025 The Padres’ 10-0 start at home is another franchise best, but at least on paper, the schedule will stiffen Monday when the Chicago Cubs — so far the only team to take a series against San Diego — visit Petco Park. Dennis Lin, New York Times, 14 Apr. 2025 The city of Fort Worth has stiffened penalties for unauthorized tree clearing in an effort to hold developers accountable and protect the city’s natural landscapes. Harrison Mantas, Fort Worth Star-Telegram, 23 Apr. 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

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Cite this Entry

“Stiffen.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/stiffen. Accessed 19 May. 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
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