Meaning of 'alert'

adjective

engaged in or accustomed to close observation

Example: "caught by a couple of alert cops"

Synonyms: watchful

adjective

mentally perceptive and responsive

Example: "an alert mind"

Synonyms: alive awake

adjective

quick and energetic

Synonyms: rattling

noun

an automatic signal (usually a sound) warning of danger

Synonyms: alarm warning signal alarum

noun

a warning serves to make you more alert to danger

Synonyms: alerting

noun

condition of heightened watchfulness or preparation for action

Example: "bombers were put on alert during the crisis"

Synonyms: qui vive

verb

to warn or arouse to a sense of danger or call to a state of preparedness

Example: "I alerted them of the impending storm."

Synonyms: alarm