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Synonyms

stiffen

American  
[stif-uhn] / ˈstɪf ən /

verb (used with object)

  1. to make stiff.


verb (used without object)

  1. to become stiff.

  2. 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.

stiffen British  
/ ˈstɪfən /

verb

  1. to make or become stiff or stiffer

  2. (intr) to become suddenly tense or unyielding

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • overstiffen verb
  • stiffener noun
  • unstiffened adjective

Etymology

Origin of stiffen

First recorded in 1490–1500; stiff + -en 1

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.

The degenerative disease creates scar tissue that stiffens the lungs making it difficult to breathe and for oxygen to enter the bloodstream.

From BBC

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

This leads the muscles to weaken and stiffen over time and ultimately impacts how you walk, talk, eat and breathe.

From BBC

No wonder OpenAI’s Sam Altman issued a “code red” alert to employees urging them to step up the pace of chatbot development in the face of stiffening competition from the likes of Google’s Gemini.

From Barron's

"This will only stiffen our resolve to ensure that we make Washington DC safe and beautiful," the Pentagon chief said.

From BBC