alert: significato e definizioni

Vigilantly attentive; watchful: alert to danger; an alert bank guard. See Synonyms at aware.

Mentally responsive and perceptive; quick.

Brisk or lively in action: the bird's alert hopping from branch to branch.

A signal that warns of attack or danger: Sirens sounded the alert for an air raid.

A condition or period of heightened watchfulness or preparation for action: Nuclear-armed bombers were put on alert during the crisis.

To notify of approaching danger or action; warn: a flashing red light that alerted motorists to trouble ahead.

on the alert Watchful and prepared for danger, emergency, or opportunity: bird watchers on the alert for a rare species.