knuckle

n.指关节；铰链结合

The prominence of the dorsal aspect of a joint of a finger, especially of one of the joints connecting the fingers to the hand.

The part of a hinge through which the pin passes.

knoll, knot, knot-hole, knotty, know, know about, know better than, know no bounds, know of, know sb. by name, know-all, know-how, knowing, knowingly, knowledgable, knowledge, knowledgeable, knowledgeably, known, known as, knuckleduster, knucklehead, KO, koala, kobo, kohl, kohlrabi, kola, kook, kookaburra, kooky, kopeck (also kopek), koppie (also kopje), Koran, Koranic, Korea, Korean, kosher, koumiss, kowtow,