constraint - a device that retards something's motion; "the car did not have proper restraints fitted"air bag - a safety restraint in an automobile; the bag inflates on collision and prevents the driver or passenger from being thrown forward airbrake, dive brake - a small parachute or articulated flap to reduce the speed of an aircraft arrester, arrester hook - a restraint that slows airplanes as they land on the flight deck of an aircraft carrier band - a restraint put around something to hold it together brake - a restraint used to slow or stop a vehicle brake pads - pads apply friction to both sides of the brake disk brake shoe, skid, shoe - a restraint provided when the brake linings are moved hydraulically against the brake drum to retard the wheel's rotation catch, stop - a restraint that checks the motion of something; "he used a book as a stop to hold the door open" chain - anything that acts as a restraint device - an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water" gag, muzzle - restraint put into a person's mouth to prevent speaking or shouting leash, tether, lead - restraint consisting of a rope (or light chain) used to restrain an animal ignition lock, lock - a restraint incorporated into the ignition switch to prevent the use of a vehicle by persons who do not have the key muzzle - a leather or wire restraint that fits over an animal's snout (especially a dog's nose and jaws) and prevents it from eating or biting sea anchor, drogue - restraint consisting of a canvas covered frame that floats behind a vessel; prevents drifting or maintains the heading into a wind trammel - a restraint that is used to teach a horse to amble |