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1. Oxford American Dictionary

   alert

   • IPA[əˈlərt]

   美式

   • adj.
     quick to notice any unusual and potentially dangerous or difficult circumstances; vigilant；able to think clearly; intellectually active
   • n.
     the state of being watchful for possible danger；an announcement or signal warning of danger
   • v.
     warn (someone) of a danger, threat, or problem, typically with the intention of having it avoided or dealt with

   • verb: alert, 3rd person present: alerts, gerund or present participle: alerting, past tense: alerted, past participle: alerted

   • noun: alert, plural noun: alerts

2. • 釋義
   • 片語

   adj.

   形容詞

   • 1. quick to notice any unusual and potentially dangerous or difficult circumstances; vigilant an alert police officer discovered a truck full of explosives schools need to be constantly alert to this problem 同義詞 vigilant, hypervigilant, wide awake, aware, watchful, ... 更多attentive, observant, circumspect, wary, chary, heedful, canny, on the lookout, on one's guard, on one's toes, all ears, keeping one's eyes open/peeled, keeping a weather eye open, on the qui vive反義詞 inattentive
   • ▪ able to think clearly; intellectually active she remained active and alert until well into her eighties 同義詞 quick-witted, sharp, bright, quick, keen, ... 更多perceptive, wide awake, responsive, agile, acute, astute, informalon the ball, on one's toes, quick off the mark, quick on the uptake, all there, with it, bright-eyed and bushy-tailed反義詞 slow

   n.

   名詞

   • 1. the state of being watchful for possible danger security forces were placed on alert 同義詞 vigilance, watchfulness, carefulness, attentiveness, guardedness, ... 更多care, caution, cautiousness, wariness, chariness, alertness, hypervigilance, circumspection, prudence, heedfulness, heed, mindfulness反義詞 carelessness
   • ▪ an announcement or signal warning of danger a bomb alert an alert sounded and all the fighters took off 同義詞 warning, caution, notification, notice, exhortation, ... 更多injunction, siren, alarm, signal, danger signal, distress signal
   • ▪ a period of vigilance in response to a warning of danger traffic was halted during the alert
   • ▪ a signal on an electronic device that prompts the user to do something or attracts their attention a vibrating alert is a discreet alternative to ringtones

   v.

   動詞

   • 1. warn (someone) of a danger, threat, or problem, typically with the intention of having it avoided or dealt with he alerted people to the dangers of smoking police were alerted after three men drove away without paying

   片語

   • on the alert