Curb

From Middle French courbe ("curve, curved object"), from Latin curvus ("bent, crooked, curved").

Full definition of curb

(plural curbs)

(North America) A row of concrete along the edge of a road; a kerb (UK)
A raised margin along the edge of something, such as a well or the eye of a dome, as a strengthening.
Something that checks or restrains.

DenhamBy these men, religion, that should be
The curb, is made the spur of tyranny.
2012, April 19, Josh Halliday, Free speech haven or lawless cesspool â€“ can the internet be civilised?, She maintains that the internet should face similar curbs to TV because young people are increasingly living online. "It's totally different, someone at Google watching the video from the comfort of their office in San Francisco to someone from a council house in London, where this video is happening right outside their front door."

A riding or driving bit for a horse that has rein action which amplifies the pressure in the mouth by leverage advantage placing pressure on the poll via the crown piece of the bridle and chin groove via a curb chain.

DraytonHe that before ran in the pastures wild
Felt the stiff curb control his angry jaws.

(North America) A sidewalk, covered or partially enclosed, bordering the airport terminal road system with an adjacent paved areas to permit vehicles to off-load or load passengers.
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.

(transitive) To rein in.
(transitive) To furnish with a curb, as a well; to restrain by a curb, as a bank of earth.
(transitive) To force to "bite the curb" (hit the pavement curb); see curb stomp.
(transitive) To damage vehicle wheels or tires by running into or over a pavement curb.
(transitive) To bend or curve.

ShakespeareVirtue itself of vice must pardon beg,
Yea, curb and woo for leave to do him good.