Alert



GRE 蓝宝 TOEFL 考研

解释

GRE 红宝书

• adj. 警惕的, 机警的; n. 警报
• ［英］ adj. 警惕的, 机警的 ( quick to think or act) ; n. 警报 ( warning) ;
• ［类］ stupor : alert / despair : hopeful ( 昏迷不再机警 / 绝望不再有希望)
• ［同］ 派生词: alertness ( n. 警戒, 戒备)

Webster Collegiate

I. adjective

• Etymology: Italian all'erta, on the watch, literally, on the height
• Date: 1618
• 1.
  • a. watchful and prompt to meet danger or emergency
  • b. quick to perceive and act
• 2. active, brisk
• Synonyms: see watchful, intelligent
• • alertly adverb
• • alertness noun

II. noun

• Date: 1803
• 1. a state of careful watching and readiness especially for danger or opportunity on 24-hour alert
• 2.
  • a. an alarm or other signal of danger
  • b. an urgent notice an alert to parents…about new immunization requirements — Ann Schrader
• 3. the period during which an alert is in effect

III. transitive verb

• Date: circa 1868
• 1. to call to a state of readiness ; warn
• 2. to make aware of alerted the public to the dangers of pesticides

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