n. 25B6; verb
infantry guarded the barricaded bridge : PROTECT, stand guard over, watch over, keep an eye on; cover, patrol, police, defend, shield, safeguard, keep safe, secure.
the prisoners were guarded by armed men : KEEP UNDER SURVEILLANCE, keep under guard, keep watch over, mind.
forest wardens must guard against poachers : BEWARE OF, keep watch for, be alert to, keep an eye out for, be on the alert/lookout for.
25B6; noun
border guards : SENTRY, sentinel, security guard, nightwatchman; protector, defender, guardian; lookout, watch; garrison; archaic watchman.
her prison guard : WARDER, warden, keeper; jailer; informal screw; archaic turnkey.
he let his guard slip and they escaped : VIGILANCE, vigil, watch, surveillance, watchfulness, caution, heed, attention, care, wariness.
a metal guard : SAFETY GUARD, safety device, protective device, shield, screen, fender; bumper, buffer.
25A0; off (one's) guard UNPREPARED, unready, inattentive, unwary, with one's defences down, cold, unsuspecting; informal napping, asleep at the wheel, on the hop.
25A0; on one's guard VIGILANT, alert, on the alert, wary, watchful, cautious, careful, heedful, chary, circumspect, on the lookout, on the qui vive, on one's toes, prepared, ready, wide awake, attentive, observant, keeping one's eyes peeled; informal keeping a weather eye out.