Meaning of ALERT in English

ALERT

[alert] adj [It all' erta, lit., on the ascent] (1618) 1 a: watchful and prompt to meet danger or emergency b: quick to perceive and act

2: active, brisk syn see watchful, intelligent -- alert.ly adv -- alert.ness n

[2]alert n (1796) 1: the state of readiness of those warned by an alert

2: an alarm or other signal of danger

3: the period during which an alert is in effect -- on the alert : on the lookout esp. for danger or opportunity [3]alert vt (ca. 1868) 1: to call to a state of readiness: warn

2: to make aware of "~ed the public to the dangers of pesticides"

Merriam-Webster English vocab.      Английский словарь Merriam Webster.