Knob
/nˈɑb/
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Definition
(noun) A rounded protuberance, especially one arising from a flat surface; a fleshy lump or caruncle.
Sentence Examples
Turn the knob and open the door.
Twist that knob to the right and the box will open.
CEFR Practice Quiz
She turned the small brass ____ on the door and walked slowly into the quiet and dark room tonight.