| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024a•lert /əˈlɜrt/USA pronunciation adj. - paying complete attention;
wide-awake:The children were alert, following the teacher's instructions. - watchful and ready to act;
vigilant:The prison guard was alert at his post.[~ + to]remained alert to the danger.
n. [countable] - a warning or alarm of an impending military attack, a storm, etc.:a tornado alert.
- the period in which such a warning or alarm is in effect.
v. [~ + object (+ to + object)] - to warn (troops, ships, etc.) to prepare for a coming attack:alerted the air squadron.
- to make aware of;
warn:alerting the townspeople to the danger.
Idioms- Idioms on the alert, prepared for danger or opportunity.
a•lert•ly, adv. a•lert•ness, n. [uncountable] WordReference Random House Unabridged Dictionary of American English © 2024a•lert (ə lûrt′),USA pronunciation adj. - fully aware and attentive;
wide-awake;
keen:an alert mind. - swift;
agile;
nimble.
n. - an attitude of vigilance, readiness, or caution, as before an expected attack.
- a warning or alarm of an impending military attack, a storm, etc.:We'd just boarded the bus when the alert sounded.
- the period during which such a warning or alarm is in effect.
- on the alert, on guard against danger;
in readiness;
vigilant:The state police are on the alert for an escaped convict believed to be in the area.
v.t. - to warn (troops, ships, etc.) to prepare for action.
- to warn of an impending raid, attack, storm, etc.:The radio alerted coastal residents to prepare for the hurricane.
- to advise or warn;
cause to be on guard:to alert gardeners to the dangers of some pesticides.
- Latin ērigere to erect
- Italian all'erta, equivalent. to all(a) to, on the + erta lookout, watchtower, origin, originally feminine of erto, past participle of ergere
- 1590–1600; 1940–45 for def. 4;
- 1.See corresponding entry in Unabridged awake, wary, observant. Alert, vigilant, watchful imply a wide-awake attitude, as of someone keenly aware of his or her surroundings. Alert describes a ready and prompt attentiveness together with a quick intelligence:The tourist was alert and eager to see the sights.Vigilant suggests some immediate necessity for keen, active observation, and for continuing alertness:Knowing the danger, the scout was unceasingly vigilant.Watchful suggests carefulness and preparedness:watchful waiting.
- 2.See corresponding entry in Unabridged brisk, lively, quick, active, sprightly, spirited.
- 1.See corresponding entry in Unabridged unaware.
|