Dictionary

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alert

English

🔊 engaged in or accustomed to close observation
“caught by a couple of alert cops”
🔊 mentally perceptive and responsive
“an alert mind”
🔊 quick and energetic
“a brisk walk in the park”
🔊 a warning serves to make you more alert to danger
🔊 condition of heightened watchfulness or preparation for action
“bombers were put on alert during the crisis”
🔊 an automatic signal (usually a sound) warning of danger
🔊 warn or arouse to a sense of danger or call to a state of preparedness
“The empty house alarmed him”