on the alert


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a·lert

 (ə-lûrt′)
adj.
1. Vigilantly attentive; watchful: alert to danger; an alert bank guard. See Synonyms at careful.
2. Mentally responsive and perceptive; quick.
3. Brisk or lively in action: the bird's alert hopping from branch to branch.
n.
1. A signal that warns of attack or danger: Sirens sounded the alert for an air raid.
2. A condition or period of heightened watchfulness or preparation for action: Nuclear-armed bombers were put on alert during the crisis.
tr.v. a·lert·ed, a·lert·ing, a·lerts
To notify of approaching danger or action; warn: a flashing red light that alerted motorists to trouble ahead.
Idiom:
on the alert
Watchful and prepared for danger, emergency, or opportunity: bird watchers on the alert for a rare species.

[French alerte, from Italian all' erta, on the lookout : alla, to the, on the (from Latin ad illam, to that : ad, to; see ad- + illam, feminine accusative sing. of ille, that, the; see al- in Indo-European roots) + erta, lookout (from past participle of ergere, to raise, from Latin ērigere; see erect).]

a·lert′ly adv.
a·lert′ness n.
Translations
مُتَأهِّب، فِي حَالَة تَأهُّب
ve střehu
éberen õrködik
á varîbergi
temkinlitetikte

alert

(əˈləːt) adjective
1. quick-thinking. She's very old but still very alert.
2. (with to) watchful and aware. You must be alert to danger.
noun
a signal to be ready for action.
verb
to make (someone) alert; to warn. The sound of gunfire alerted us to our danger.
aˈlertly adverb
aˈlertness noun
on the alert
on the watch (for). We were on the alert for any sound that might tell us where he was.
References in classic literature ?
No method nor discipline can supersede the necessity of being forever on the alert.
It was at the extreme western limit of the buffalo range, and these animals had recently been completely hunted out of the neighborhood by the Nez Perces, so that, although the hunters of the garrison were continually on the alert, ranging the country round, they brought in scarce game sufficient to keep famine from the door.