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on the alertphrase paying close attention usually for the purpose of anticipating approaching danger or opportunityResidents were warned to stay on the alert for changes in the storm's projected path. alert, Argus-eyed, attentive, awake, observant, open-eyed, tenty(also tentie, Scottish), vigilant, watchful, wide-awake alive, aware, conscious, sensitivecognizant, heedful, keen, mindful, observing, regardful, sharp, sharp-eyedhyperalert, hypervigilant, sleepless, wakefulcareful, cautious, chary, waryprepared, ready on guard, on one's toes, on the ball, on the qui vive, on tiptoe asleep absent, absentminded, absorbed, abstracted, daydreaming, dazed, distracted, dreaming, dreamy, engrossed, faraway, insensible, oblivious, preoccupiedsleeping, unaware, unconscious, unknowing, unwittingcareless, heedless, inattentive, unheeding, unmindful, unthinking, unwaryunprepared, unready |