a rim, especially of joined stones or concrete, along a street or roadway, forming an edge for a sidewalk.
anything that restrains or controls; a restraint; check.
an enclosing framework or border.
Also called curb bit. a bit used with a bridoon for control of a horse, to which a chain (curb chain) is hooked.
Also called curb market;, British, kerb market, kerbstone market. a market, originally on the sidewalk or street, for the sale of securities not listed on a stock exchange. Compare American Stock Exchange.
the framework around the top of a well.
the arris between an upper and a lower slope on a gambrel or mansard roof.
a belt of metal, masonry, etc., for abutting a dome at its base.
(in a windmill) the track on which the cap turns.
Veterinary Pathology. a swelling on the lower part of the back of the hock of a horse, often causing lameness.
Engineering. the cutting edge at the bottom of a caisson.
Carpentry. purlin plate.
verb (used with object)
to control as with a curb; restrain; check.
to cause to keep near the curb: Curb your dog.
to furnish with or protect by a curb.
to put a curb on (a horse).
Also, British, kerb (for defs 1, 15).

1250–1300; Middle English curb, courbe curved piece of wood (noun), stooped, hunchbacked (adj.) < Anglo-French curb, courb curved, bowed; Old French < Latin curvus crooked, bent, curved. See curve

curbable, adjective
curbless, adjective
curblike, adjective
uncurb, verb (used with object)
uncurbable, adjective
uncurbed, adjective

curb, kerb.

13. bridle, repress. See check1.

13. encourage. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
curb1 (kɜːb)
1.  something that restrains or holds back
2.  any enclosing framework, such as a wall of stones around the top of a well
3.  a.  Also called: curb bit a horse's bit with an attached chain or strap, which checks the horse
 b.  Also called: curb chain the chain or strap itself
4.  a hard swelling on the hock of a horse
5.  to control with or as if with a curb; restrain
[C15: from Old French courbe curved piece of wood or metal, from Latin curvus curved]

vet science a swelling on the leg of a horse, below the point of the hock, usually caused by a sprain

kerb or (US and Canadian) curb (kɜːb)
1.  a line of stone or concrete forming an edge between a pavement and a roadway, so that the pavement is some 15 cm above the level of the road
2.  (tr) to provide with or enclose with a kerb
[C17: from Old French courbe bent, from Latin curvus; see curve]
curb or (US and Canadian) curb
[C17: from Old French courbe bent, from Latin curvus; see curve]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 15c., "strap passing under the jaw of a horse," from O.Fr. courbe "curve, curb," from L. curvus, from curvare "to bend" (see curve). Meaning "enclosed framework" is from 1510s, probably originally with a notion of "curved;" extended to margins of garden beds 1731; to
"margin of stone between a sidewalk and road" 1836 (sometimes spelled kerb). The verb (1520s) is from the notion of putting a curb on a horse; fig. sense first attested 1580s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Another means to curb them is to balance them by others as proud as they.
V ideo teleconferencing is often touted for its potential to promote better
  communications and curb expensive travel.
The potential of plug-in hybrids and electric vehicles to curb petroleum use
  has grabbed a lot of attention lately.
However, drugs designed to curb stroke damage by blocking glutamate's effects
  have shown disappointing results in clinical trials.
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