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"
S: (v) suppress, stamp down, subdue, conquer (bring under control by force or authority) "suppress a nascent uprising"; "stamp down on littering"; "conquer one's desires"
S: (v) silence (keep from expression, for example by threats or pressure) "All dissenters were silenced when the dictator assumed power"
S: (v) squelch, quell, quench (suppress or crush completely) "squelch any sign of dissent"; "quench a rebellion"
S: (v) quench (electronics: suppress (sparking) when the current is cut off in an inductive circuit, or suppress (an oscillation or discharge) in a component or device)
S: (v) damp (restrain or discourage) "the sudden bad news damped the joyous atmosphere"
S: (v) mortify, subdue, crucify (hold within limits and control) "subdue one's appetites"; "mortify the flesh"
S: (v) mortify (practice self-denial of one's body and appetites)
S: (v) deny, abnegate (deny oneself (something); restrain, especially from indulging in some pleasure) "She denied herself wine and spirits"
S: (v) train (cause to grow in a certain way by tying and pruning it) "train the vine"