'STIFFEN UP' Phrasal Verb

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Definition of Stiffen up phrasal verb

Stiffen up

1. Become rigid
   (Intransitive | International English)
   
   » Example: My back STIFFENS UP in cold weather.
2. Make something rigid
   (Separable [optional] | International English)
   
   » Example: They used starch to STIFFEN the collars UP.