alerts

(noun) condition of heightened watchfulness or preparation for action. Synonyms: alert, qui vive. Example: "Bombers were put on alert during the crisis."

(noun) a warning serves to make you more alert to danger. Synonyms: alert, alerting.

(noun) an automatic signal (usually a sound) warning of danger. Synonyms: alarm, alert, warning signal, alarum.

(verb) warn or arouse to a sense of danger or call to a state of preparedness. Synonyms: alarm, alert. Examples: "The empty house alarmed him." "We alerted the new neighbors to the high rate of burglaries."