| 单词 | alert |
| 释义 | Word Frequency alert(əˈlɜːt) adjective (usually postpositive) 1. vigilantly attentive alert to the problems 2. brisk, nimble, or lively noun 3. an alarm or warning, esp a siren warning of an air raid 4. the period during which such a warning remains in effect 5. on the alert verb (transitive) 6. to warn or signal (troops, police, etc) to prepare for action 7. to warn of danger, an attack, etc Derived forms alertly (aˈlertly) adverb alertness (aˈlertness) noun Word origin C17: from Italian all'erta on the watch, from erta lookout post, from ergere to build up, from Latin ērigere; see erect |
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