A‐lert″, n.(Mil.) An alarm from a real or threatened attack; a sudden attack; also, a bugle sound to give warning. “We have had an alert.” Farrow.
On the alert, on the lookout or watch against attack or danger; ready to act.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.