/ nɒb; NAmE nɑːb/ noun
1.
a round switch on a machine such as a television that you use to turn it on and off, etc. :
the volume control knob
2.
a round handle on a door or a drawer
3.
a round lump on the surface or end of sth
4.
( especially BrE ) a small lump of sth such as butter
5.
( BrE , taboo , slang ) a penis
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IDIOMS
- with knobs on
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WORD ORIGIN
late Middle English : from Middle Low German knobbe knot, knob, bud.