'STIFFEN UP' Phrasal Verb

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.
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