Definition of "Elbow" :

noun: the joint of a mammal or bird that corresponds to the human elbow

noun: the part of a sleeve that covers the elbow joint

"His coat had patches over the elbows."

noun: a sharp bend in a road or river

noun: a length of pipe with a sharp bend in it

noun: hinge joint between the forearm and upper arm and the corresponding joint in the forelimb of a quadruped

verb: shove one's elbow into another person's ribs

verb: push one's way with the elbows