a check or restraint on something

plans to introduce tougher curbs on insider dealing

a type of bit with a strap or chain attached which passes under a horse's lower jaw, used as a check

a swelling on the back of a horse's hock, caused by spraining a ligament

restrain or keep in check

she promised she would curb her temper

lead (a dog being walked) near the curb to urinate or defecate, in order to avoid soiling buildings, pavements, etc.

a stone edging to a pavement or raised path

the car mounted the kerb and collided with a tree