ALERT

ALERT', adjective 1. Watchful; vigilant; active in vigilance. hence the military phrase, upon the alert upon the watch, guarding against surprise or danger.2. Brisk; nimble; moving the celerity.

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alert. Alert, a. quick, nimble, brisk, lively

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A‐lert″ (ȧ‐lẽrt″), a. [[F. alerte, earlier à l'erte on the watch, fr. It. all' erta on the watch, prop. (standing) on a height, where one can look around; erta a declivity, steep, erto steep, p. p. of ergere, erigere, to erect, raise, L. erigere. See Erect.]] 1. 1. Watchful; vigilant; active in vigilance.
2. 2. Brisk; nimble; moving with celerity.
An alert young fellow. Addison. Syn. — Active; agile; lively; quick; prompt.