A knob is a small protrusion or rounded shape used for turning, lifting, or grasping something.
You'll often find knobs on doors, cabinets, and machines, which are usually small and easy to turn with your hand. Think about the door handles you use every day - those are probably knobs too! They're simple but useful, and they come in all sorts of materials like metal, wood, or plastic. Sometimes a knob can be just for show, adding a decorative touch to an old-fashioned clock or other object. In electronics and construction, a knob might refer to a small round control, like the one on a light switch or thermostat.
How common is "knob"?
Word knob is considered uncommon in modern English. It appears most frequently in fiction texts and less often in other writings.
Definitions
noun
A rounded protuberance, especially one arising from a flat surface; a fleshy lump or caruncle.
A rounded control switch that can be turned on its axis, designed to be operated by the fingers.
A ball-shaped part of a handle, lever, etc., designed to be grabbed by the hand.
A rounded ornament on the hilt of an edged weapon; a pommel.
A prominent, rounded bump along a mountain ridge.
A prominent rounded hill.
(chiefly in the plural) A woman's breast.
The penis.
The head of the penis; the glans.
(by analogy with above) A contemptible person.
A dollop, an amount just larger than a spoonful (usually referring to butter).
A chunky branch-like piece, especially of a ginger rhizome.
A bulb of the garlic plant consisting of multiple cloves.