An Elbow

1. (anatomy) The joint between the upper arm and the forearm. Synonym: elbow joint
2. (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.
3. (US, dated, early 20th-century slang) A detective.
4. (basketball) Part of a basketball court located at the intersection of the free-throw line and the free-throw lane.^[1]
5. A hit with the elbow.