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," from PIE root *sker- (2) "to turn, bend." 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.
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