Meaning of ALERT in English

ALERT

adj., n., & v.

--adj.

1. watchful or vigilant; ready to take action.

2 nimble (esp. of mental faculties); attentive.

--n.

1. a warning call or alarm.

2 a warning of an air raid. b the duration of this.

--v.tr. (often foll. by to) make alert; warn (were alerted to the danger).

Phrases and idioms:

on the alert on the lookout against danger or attack.

Derivatives:

alertly adv. alertness n.

Etymology: F alerte f. It. all' erta to the watch-tower

Oxford English vocab.      Оксфордский английский словарь.