American English

Definition of firm up phrasal verb from the Oxford Advanced American Dictionary

 

firm up

 phrasal verb
phrasal verb
 
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Phrasal Verbs
to become harder or more solid Put the mixture somewhere cool to firm up.

    firm up something

     
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  1. 1to make arrangements more final and fixed The company has not yet firmed up its plans for expansion. The precise details still have to be firmed up.
  2. 2 to make something harder or more solid A few weeks of Pilates will firm up that flabby stomach.
See the Oxford Advanced Learner's Dictionary entry: firm up