Curb  —n. 1 check, restraint. 2 strap etc. Passing under a horse's lower jaw, used as a check. 3 enclosing border, e.g. The frame round a well or a fender round a hearth. 4 = *kerb. —v. 1 restrain. 2 put a curb on (a horse). [french: related to *curve]