noun / verb
elbow
EL-boh/ˈelbəʊ/
The joint where the arm bends.
The elbow forms the bend in this human arm.

Etymology
Old English elnboga literally named the “bend of the forearm.” The name identifies the joint through its function: the point where the arm bends.
In context
it causes the extension of the arm at the elbow hinge joint
More examples
- She rests her elbows on the table.
- I scraped my elbow when I fell.
- He elbowed me gently to get my attention.
- She elbows her way through the crowd.
Forms
elbow · elbows · elbowed · elbowing