stiffen
Americanverb (used with object)
verb (used without object)
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to become stiff.
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to become suddenly tense, rigid, or taut, as in bracing oneself for or drawing back from shock, fear, or displeasure.
He stiffened, expecting to hear the worst.
verb
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to make or become stiff or stiffer
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(intr) to become suddenly tense or unyielding
Other Word Forms
Derived Forms
Inflected Forms
Participles
Conjugated Forms
Present
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stiffensimple
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stiffenssimple
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have stiffenedperfect
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has stiffenedperfect
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am stiffeningprogressive
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are stiffeningprogressive
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is stiffeningprogressive
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have been stiffeningperfect progressive
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has been stiffeningperfect progressive
Past
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stiffenedsimple
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had stiffenedperfect
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was stiffeningprogressive
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were stiffeningprogressive
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had been stiffeningperfect progressive
Future
Etymology
Origin of stiffen
Explanation
To stiffen is to become stiff or unbending. If your legs stiffen during a long plane flight, you'll want to stretch them out once you land. You can stiffen something deliberately, like when you stiffen a package with cardboard to protect it in the mail. You can also stiffen in reaction to something: "The spooky creaking sounds upstairs made us stiffen in terror." The earliest sense of this verb was "make steadfast," from a now-obsolete meaning of stiff, "gain strength."
Vocabulary lists containing stiffen
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.
Depending on the situation, the material can bend, buckle, or stiffen in different ways, all without electronics, sensors, or active control systems.
From Science Daily • Jun. 11, 2026
Chinese leader Xi Jinping has said that young people should stiffen their spines and embrace hardship.
From The Wall Street Journal • Apr. 28, 2026
She has also vowed to stiffen prison sentences and to impose a state of emergency in areas worst hit by crime.
From Barron's • Feb. 1, 2026
Calling the eradication of extortion “one of the great challenges” facing Mexico, Sheinbaum pledged to bolster enforcement, stiffen penalties and increase safeguards for anyone receiving threats.
From Los Angeles Times • Dec. 16, 2025
Meryra would have a sorry and crooked bowl, he reflected, if he did not hold his elbow higher, and he must stiffen his wrist or that sharp-edged hammer would leave marks all over the gold.
From "The Golden Goblet" by Eloise Jarvis McGraw
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.
