Curb

1. To bend or curve
2. A frame or wall round the mouth of a well; also, a frame within a well to prevent the earth caving in.
3. A swelling on the back part of the hind leg of a horse, just behind the lowest part of the hock joint, generally causing lameness.
4. An assemblage of three or more pieces of timber, or a metal member, forming a frame around an opening, and serving to maintain the integrity of that opening; also, a ring of stone serving a similar purpose, as at the eye of a dome.
5. That which curbs, restrains, or subdues; a check or hindrance; esp., a chain or strap attached to the upper part of the branches of a bit, and capable of being drawn tightly against the lower jaw of the horse.
6. To bend; to crouch; to cringe.
7. To furnish wich a curb, as a well; also, to restrain by a curb, as a bank of earth.
8. A curbstone.
9. To guide and manage, or restrain, as with a curb; to bend to one's will; to subject; to subdue; to restrain; to confine; to keep in check.