Webster's Revised Unabridged Dictionary · 1913

Curb

Curb (kûrb) , transitive verb

[French courber to bend, curve, Latin curvare, from curvus bent, curved; compare Greek kyrto`s curved. Compare Curve.]

1.
To bend or curve. [Obsolete]
Crooked and curbed lines. — Holland
2.
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.
Part wield their arms, part curb the foaming steed. — Milton
Where pinching want must curb thy warm desires. — Prior
3.
To furnish with a curb, as a well; also, to restrain by a curb, as a bank of earth.

Curb , intransitive verb

To bend; to crouch; to cringe. [Obsolete]
Virtue itself of vice must pardon beg, Yea, curb and woo for leave to do him good. — Shakespeare

Curb , noun

1.
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.
He that before ran in the pastures wild Felt the stiff curb control his angry jaws. — Drayton
By these men, religion,that should be The curb, is made the spur of tyranny. — Denham
2.
(Architecture) 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.
3.
A frame or wall round the mouth of a well; also, a frame within a well to prevent the earth caving in.
4.
A curbstone.
5.
(Farriery) 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. — James Law
Collocations (4)
Curb bit , a stiff bit having branches by which a leverage is obtained upon the jaws of horse. — Knight
Curb pins (Horology) , the pins on the regulator which restrain the hairspring.
Curb plate (Architecture) , a plate serving the purpose of a curb.
Deck curb , See under Deck.