be on the alert against Synonym

guarding, monitoring, surveying, policing, watching, inspecting, patrolling, overseeing, scouting [x]

guardian, defender, custodian, safeguard, shield, sentinel, watchman, bodyguard, warden, overseer, patron, advocate, champion, preserver, guardian angel, protectorate, security, keeper, minder, guardian spirit, protector god, guardian deity, guardian figure, guardian force, guardian power, guardian entity, guardian presence, guardian being, guardian essence, guardian soul, guardian energy, guardian light, guardian strength, guardian support, guardian aid, guardian help, guardian assistance, guardian defense, guardian protection, guardian care, guardian watch, guardian oversight, guardian supervision, guardian vigilance, guardian watchfulness, guardian alertness, guardian attentiveness [x]

protector, sentinel, watchman, custodian, defender, guardian, warden, sentry, lookout, patrol, keeper, bodyguard, watch, security, safeguard, overseer, escort, shield, chaperone, minder, protectorate, warder, watchperson, doorkeeper, gatekeeper, bouncer, caretaker, steward, marshal, ranger, watchkeeper, watchguard, surveillant, observer, monitor, supervisor, attendant, guardian angel, proctor, watchful eye, security officer, security guard, security personnel, security detail, security agent, security operative, security enforcer, security monitor [x]

security guard, security officer, security personnel, security staff, security operative, security enforcer, security watchman, security sentinel, security protector, security patroller, security warden, security custodian, security monitor, security supervisor, security overseer, security attendant, security detail, security bodyguard, security bouncer, security doorman, security gatekeeper, security marshal, security ranger, security sentry, security watchkeeper, security lookout, security guardian, security chaperone, security escort [x]

watch-for, keep-an-eye-out-for, be-alert-for, beigilant-for, be-watchful-for, be-on-guard-for, be-aware-of, be-wary-of, be-cautious-of, be-on-the-alert-for, be-on-the-watch-for, be-on-the-hunt-for, be-on-the-search-for, be-on-the-scout-for, be-on-the-qui-vive-for [x]

alert, vigilant, attentive, watchful, observant, ready, prepared, cautious, aware, sharp, quick, responsive, nimble, agile, awake, perceptive, mindful, wary, guarded, heedful, careful, prudent, circumspect, on guard, on the lookout, on the alert, on the ball, on the qui vive, on the watch [x]

alert, conscious, aware, wakeful, vigilant, attentive, roused, aroused, up, stirring, active, lively, cognizant, observant, perceptive, responsive, sharp, bright, quick, on the ball, on one's toes, on the alert, on guard, watchful, sleepless, unsleeping, wide-awake, clear-headed, clear-eyed, clear-sighted [x]

alert, vigilant, watchful, attentive, observant, sleepless, aware, conscious, perceptive, sharp, wary, heedful, mindful, on guard, on the lookout, on the alert, wide-awake, quick-eyed, eagle-eyed, sharp-eyed, clear-eyed, open-eyed, unsleeping, insomniac, restless, wakeful [x]

alert, vigilant, watchful, attentive, observant, aware, conscious, sharp, perceptive, quick, responsive, on guard, on the ball, on the lookout, on one's toes, ready, prepared, mindful, heedful, wary, sleepless, wakeful, unsleeping, bright-eyed, clear-headed, sharp-eyed, eagle-eyed, quick-witted, sharp-witted, on the alert, on the qui vive [x]

vigilant, watchful, attentive, observant, alert, cautious, wary, on guard, on the lookout, on one's toes, ready, prepared, aware, sharp-eyed, eagle-eyed, quick to notice, on the qui vive, on the ball, wide-awake, sleepless, wakeful, heedful, mindful, perceptive, responsive, alive, awake, conscious, sharp, keen [x]

vigilant, watchful, alert, observant, attentive, on guard, on the watch, on the alert, wary, cautious, eagle-eyed, sharp-eyed, wide-awake, on one's toes, on the qui vive, on the ball, quick off the mark, ready, prepared, primed, aware, heedful, mindful, circumspect, careful, awake, sleepless, unsleeping, wakeful, on the lookout [x]

advance notice, forewarning, heads-up, early warning, preliminary notice, advance alert, prior notice, pre-warning, advance notification, early alert, advance intimation, pre-notification, advance caution, prior alert, early notice, advance heads-up, pre-alert, advance advisory, prior intimation, early notification [x]

alert, forewarning, heads-up, notice, notification, caution, advance notice, advance warning, premonition, red flag, signal, tip-off, wake-up call, advisory, alarm, warning sign, heads-up alert, preliminary warning, prior warning, early alert, early notice, early signal, early indication, advance alert, advance signal, advance indication [x]

alert, attentive, sharp, quick, perceptive, aware, vigilant, responsive, observant, ready, prepared, focused, keen, astute, nimble, agile, smart, savvy, quick-witted, proactive [x]

warning, caution, admonition, alert, notice, forewarning, heads-up, red flag, advisory, alarm, sign, signal, tip-off, hint, indication, reminder, wake-up call, precaution, proviso, stipulation, condition, restriction, limitation, qualification, reservation, clause, requirement, constraint, caveat emptor, cautionary note, cautionary advice, cautionary statement, cautionary warning, cautionary reminder, cautionary alert, cautionary indication, cautionary sign, cautionary signal, cautionary tip-off, cautionary hint, cautionary notice, cautionary forewarning, cautionary heads-up, cautionary red flag, cautionary advisory, cautionary alarm, cautionary wake-up call [x]