Definition Of knuckle
a part of a finger at a joint where the bone is near the surface, especially where the finger joins the hand.
Charlotte rapped on the window with her knuckles
rub or press (something, especially the eyes) with the knuckles.
Cora followed suit, knuckling the small of her back and grateful to be off her feet.
Example Of knuckle
a knuckle of pork
A small boy laughed at me on the street and shouted something about girls and tongues so I pinned him down and knuckled his head.
‘Aye, aye, sir,’ they said knuckling their foreheads.
Brian rubbed his thumb back and forth over my index finger knuckle , tickling me a little bit.
Can you imagine the knuckly bits this poor, unwitting woman in San Jose endured as she sat down to dinner Tuesday evening?