knob noun
ADJ. door | control, volume Adjust the control knobs by pressing lightly.
VERB + KNOB adjust, fiddle with, touch, turn, twiddle I've tried twiddling the knobs, but nothing seems to happen.
KNOB + VERB adjust sth, control sth
PREP. ~ on the knobs on the radio
You can also check other dicts: knob (English, 中文解释 ), wordnet sense, Collins Definition