stiffen up

verb

To become rigid, tense or stiff.

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Meanings

verbstiffen up (third-person singular simple present stiffens up, present participle stiffening up, simple past and past participle stiffened up)

present singular third person stiffens up · participle present stiffening up · participle past stiffened up · past stiffened up

  1. To become rigid, tense or stiff.

Synonyms & antonyms

Also see
stiff up
Cite this entry
APA

stiffen up. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/stiffen%20up

MLA

“stiffen up.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/stiffen%20up. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “stiffen up,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/stiffen%20up.

Source: stiffen up on Wiktionary, CC BY-SA 4.0.