S: (n) bridle, check, curb (the act of restraining power or action or limiting excess) "his common sense is a bridle to his quick temper"
Verb
S: (v) control, hold in, hold, contain, check, curb, moderate (lessen the intensity of; temper; hold in restraint; hold or keep within limits) "moderate your alcohol intake"; "hold your tongue"; "hold your temper"; "control your anger"