curbyoudaoicibaDictYouDict[curb 词源字典]
curb: [15] Ultimately, curb and curve are the same word. Latin curvāre ‘bend’ passed into Old French as courber, which Middle English borrowed as courbe ‘bend’. This seems to have formed the basis of a noun courbe or curb, which was originally used for a strap to restrain a horse, the underlying meaning perhaps being that pulling on the strap ‘bent’ the horse’s neck, thereby restraining it.

The sense ‘enclosing framework’ began to emerge in the early 16th century, perhaps mainly through the influence of the French noun courbe, which meant ‘curved piece of timber, iron, etc used in building’. Its chief modern descendant is ‘pavement edge’, a 19th-century development, which has generally been spelled kerb in British English.
=> circle, crown, curve[curb etymology, curb origin, 英语词源]
curb (n.)youdaoicibaDictYouDict
late 15c., "strap passing under the jaw of a horse" (used to restrain the animal), from Old French courbe (12c.) "curb on a horse," from Latin curvus, from curvare "to bend" (see curve (v.)). 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" 1791 (sometimes spelled kerb). Figurative sense of "a check, a restraint" is from 1610s.
curb (v.)youdaoicibaDictYouDict
1520s, of horses, "to lead to a curb," from curb (n.). Figurative use from 1580s. Related: Curbed; curbing.