Definitions
1.nounThe joint between the upper arm and the forearm.
2.noun(by extension) Any turn or bend like that of the elbow, in a wall, building, coastline, etc.; an angular or jointed part of any structure, such as the raised arm of a chair or sofa, or a short pipe fitting, turning at an angle or bent."the sides of windows, where the jamb makes an elbow with the window back"
3.nounA detective.
4.nounPart of a basketball court located at the intersection of the free-throw line and the free-throw lane.
5.nounA hit with the elbow.
6.verbTo push with the elbow."He elbowed his way through the crowd."
7.verb(by extension) To nudge, jostle or push.