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

 

crank up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    crank somethingup

    (informal)
     
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  1. 1to make a machine, etc. work or work at a higher level
  2. 2to make music, etc. louder synonym turn up Crank up the volume!
See the Oxford Advanced Learner's Dictionary entry: crank up