Definitions from Wiktionary (stiffen up)
▸ verb: To become rigid, tense or stiff.
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▸ verb: To become rigid, tense or stiff.
Similar:
seize up,
starken,
rigor mortis,
calcify,
lignify,
tighten up,
petrify,
brace,
sclerotise,
tighten,
more...
Opposite:
▸ Words similar to stiffen up
▸ Usage examples for stiffen up
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▸ Wikipedia articles (New!)
▸ Words that often appear near stiffen up
▸ Rhymes of stiffen up
▸ Invented words related to stiffen up