EL'BOW, noun

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.