Synonyms to on the lookout

alert, Klaxon, Mayday, SOS, active, admonish, advertent, advise, agile, agog, air-raid alarm, alarm, alarm bell, alarm clock, alarm signal, alarum, alert for, alive, all clear, all ears, all eyes, animated, apt, arouse, assiduous, attentive, awake, aware, beacon, blinking light, brainy, breathe, bright, brilliant, burglar alarm, buzz, buzzer, cant, careful, caution, cautious, clear-sighted, clear-witted, clearheaded, clever, concentrated, confide, confide to, conscious, crostarie, cry havoc, cry wolf, decisive, diligent, earnest, entrust with information, equal to, expeditious, fiery cross, finical, finicking, finicky, fire alarm, fire bell, fire flag, five-minute gun, flashing light, fly storm warnings, fog bell, fog signal, foghorn, forewarn, frighten, frisky, full of life, gale warning, gay, give confidential information, give fair warning, give notice, give warning, heedful, hooter, horn, hue and cry, hurricane warning, immediate, instant, instantaneous, intense, intent, intentive, issue an ultimatum, keen, knowing, let in on, let next to, lighthouse, lively, loaded for, lookout, mention privately, mercur