a rim, especially of joined stones or concrete, along a street or roadway, forming an edge for a sidewalk.
2.
anything that restrains or controls; a restraint; check.
3.
an enclosing framework or border.
4.
Also called curb bit. a bit used with a bridoon for control of a horse, to which a chain (curb chain) is hooked.
5.
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.
Origin: 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
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.