Definition of knob noun from the Oxford Advanced Learner's Dictionary

     

    knob

     noun
    noun
    BrE BrE//nɒb//
     
    ; NAmE NAmE//nɑːb//
     
    Watching TV, How machines work
     
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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 See related entries: Watching TV, How machines work
  2. 2a round handle on a door or a drawer
  3. 3a round lump on the surface or end of something
  4. 4(especially British English) a small lump of something such as butter
  5. 5(British English, taboo, slang) a penis More Like This Silent letters gnarled, gnash, gnat, gnaw, gnome haute cuisine, heir, (NAmE herb), honour, hors d’oeuvre, hour knack, knee, kneel, knife, knight, knit, knob, knock, knot, know, knuckle psalm, psephology, psychic, ptarmigan, pterodactyl, psychology wrangle, wrap, wreath, wreck, wrench, wrestle, wriggle, wring, write, wrong bomb, climb, crumb, doubt, lamb, limb ascent, fascinate, muscle, scene, scissors height, right, sleigh, weight align, campaign, design, foreign, malign, reign, unfeigned balmy, calm, calf, half, yolk autumn, column, condemn, damn, hymn, solemn bristle, fasten, listen, mortgage, soften, thistle, wrestle biscuit, build, circuit, disguise, guilty, league, rogue, vague yacht answer, sword, twoSee worksheet.
  6. Word Origin late Middle English: from Middle Low German knobbe ‘knot, knob, bud’.Extra examples I tried the knob, and this time the door opened. I’ve tried fiddling with the knobs, but nothing seems to happen. the knobs on the radio She turned the heavy brass door knob.Idioms (British English, slang) used to say that something is a more complicated version of what you mention It isn't art—it's just a horror movie with knobs on!
See the Oxford Advanced American Dictionary entry: knob