To secure against injury of any kind in any manner; specifically, to protect by attendance; defend; keep in safety; accompany as a protection.To provide or secure against objections, or the attacks of hostile criticism or malevolence.To protect the edge of, especially by an ornamental border; hence, to adorn with lists, laces, or ornaments.To fasten on a guard for the purpose of binding.To insert guards between the leaves of (an intended guard-book).Synonyms To shield, shelter, watch.To watch by way of caution or defense; be cautious; be in a state of caution or defense.n. A state of readiness to oppose attack; a state of defense; in general, a state of protection against injury or impairment of any kind.n. Specifically, a state of caution or vigilance; attentive observation designed to prevent surprise or attack; watch; heed: as, to keep guard; to be on one's guard; to keep a careful guard over the tongue.n. One who or that which protects or keeps in safety; one who or that which secures against danger, attack, loss, or injury; one who keeps protecting watch.n. Specifically— A man or body of men occupied in preserving a person or place from attack or injury, or in preventing an escape; he or they whose business it is to defend, or to prevent attack or surprise: as, a body-guard; a prison guard.n. Anything that keeps off evil: as, modesty is the guard of innocence.n. That which secures against hostile criticism or censure; a protection against malevolent or ignorant attacks upon one's reputation, opinions, etc.n. In fencing or boxing, a posture of passive defense; the arms or weapon in such a posture: as, to beat down one's guard.n. In the game of cricket, the position of the bat for most effectually defending the wicket.n. In Great Britain, a person who has charge of a mail-coach or a railway-train; a conductor; in the United States, a brakeman or gatekeeper on an elevated railroad.n. plural In cricket, the pads or protectors worn on the legs to prevent injury from swiftly thrown balls.n. Any part, appliance, or attachment designed or serving to protect or secure against harmful contact, injury, loss, or detriment of any kind.n. A chain or cord for fastening a watch, brooch, or bracelet to the dress of the wearer.n. Nautical, the railing of the promenade-deck of a steamer, intended to prevent persons from falling overboard; also, a widening of the deck of a side-wheel steamer by a framework of strong timbers which curve out on each side to the paddle-wheels, and protect them against collision with wharfs and boats.n. A metal frame placed over a nut in an engine, to prevent it from being jarred off.n. One of the fingers in a harvester in which the knives of the cutter-bar move.n. In bookbinding: A reinforcing slip placed between the leaves of a blank book designed for an album or a scrap-book. A narrow strip or narrow strips of paper sewed near the back of a book, made for inserted plates, with intent to keep the book flat, and prevent it from being thicker at the fore edge than at the back.n. A tide-lock between a dock and a river.n. The guard-plate of the door that closes the opening of a cupola-furnace.n. A supplementary safetyrail of heavy timber placed beside a rail in a railway, at a switch or upon a bridge.n. In a vehicle, a hood secured to the axle or bolster, and extending over the nave or hub, to protect the axle from mud.n. A fender.n. A bar or bars placed across a window.n. A guard-ring.n. An iron strap formed into a hoop or hook, attached to the insulator of a telegraph-line to prevent the wire from falling if the insulator is broken.n. In Cephalopoda, the rostrum, a calcareous shell guarding the apex of the phragmacone, as of a belemnite. See cut under belemnite.n. A piece of strong leather to which is attached an iron plate, and which is secured by straps to the right leg of an artillery driver to protect it from injury by the carriage-pole.n. In fencing, in the attitude most advantageous for attack or defense. Rolando (ed. Forsyth), Modern Art of Fencing.n. In foot-ball, basket-ball, and similar games, a player occupying a certain position.n. In fortification, the keep of a castle; the lodging of the main guard.