Definition of knob noun from the Oxford Advanced American Dictionary

     

    knob

     noun
    noun
    NAmE//nɑb//
     
     
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  1. 1a round switch on a machine such as a television that you use to turn it on and off, etc. the volume control knob
  2. 2a round handle on a door or a drawer
  3. 3 a round lump on the surface or end of something
See the Oxford Advanced Learner's Dictionary entry: knob