Knob  n. 1 rounded protuberance, esp. At the end or on the surface of a thing, e.g. The handle of a door, drawer, a radio control, etc. 2 small piece (of butter etc.).  with knobs on slang that and more (same to you with knobs on).  knobby adj. Knoblike adj. [low german knobbe knot, knob]