Definition of dial down phrasal verb from the Oxford Advanced Learner's Dictionary

 

dial down

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1to reduce the noise, heat, etc. produced by a piece of equipment by moving its controls synonym turn somethingdown The event organizers took the hint and dialled down the background music.
  2. 2(informal) to reduce the amount, degree or power of a quality He called on both sides to dial down the anger and rhetoric and start talking to each other.