n. 1.hinge joint between the forearm and upper arm and the corresponding joint in the forelimb of a quadruped 2.a sharp bend in a road or river 3.a length of pipe with a sharp bend in it 4.the part of a sleeve that covers the elbow 5.the joint of a mammal or bird that corresponds to the human elbow elbow v. 1.push one's way with the elbows 2.shove one's elbow into another person's ribs