Elbow

1. The joint or bend of the arm between the forearm and the upper arm. Keep your elbows close to your side when marching.
2. The bony outer projection of this joint. He jabbed his elbow into my side.
3. Something having a bend or an angle similar to an elbow. We need a copper 90 degree elbow to repair our plumbing.
4. To open up (a means of passage, for example) by or with the elbow. She elbowed her way through the crowd.