1. The outer angle made by the bend of the arm.
The wings that waft our riches out of sight
Grow on the gamester's elbows.
2. Any flexure or angle; the obtuse angle of a wall, building or road.
To be at the elbow is to be very near; to be by the side; to be at hand.
EL'BOW, verb transitive To push with the elbow
1. To push or drive to a distance; to encroach on.
He'll elbow out his neighbors.
EL'BOW, verb intransitive To jut into an angle; to project; to bend.