Definition of Stiffen up phrasal verb
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Stiffen up phrasal verb
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Meaning: Become rigid
(Intransitive | International English)
» Example: My back STIFFENS UP in cold weather. -
Meaning: Make something rigid
(Separable [optional] | International English)
» Example: They used starch to STIFFEN the collars UP.
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Meaning: Become rigid