on alert

Main Entry:
on call
Part of Speech: adjective
Definition: ready to work
Synonyms: accessible, at hand, at one's beck and call, at one's disposal, at one's fingertip, available, handy, night call, on alert, on deck, on the spot, on-call, prepared, standing by, within reach
Main Entry: wakeful
Part of Speech: adjective
Definition: alert, restless
Synonyms: alive, astir, attentive, careful, heedful, insomniac, insomnious, observant, on guard, on the alert, on the lookout, on the qui vive, sleepless, unsleeping, vigilant, waking, wary, watchful, wide-awake
Antonyms: sleepy, unaware
Main Entry: unsleeping
Part of Speech: adjective
Definition: wakeful
Synonyms: alive, astir, attentive, awake, careful, heedful, insomniac, insomnious, observant, on guard, on the alert, on the lookout, on the qui vive, sleepless, vigilant, waking, wary, watchful, wide-awake
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