alert

警觉的；警惕的； 机警的

机灵的；活跃的

警报

警戒期间

（常与to连用）警告

alert

提防的, 警惕的

警惕, 警报

alert

1. condition of heightened watchfulness or preparation for action; "bombers were put on alert during the crisis"

(synonym)

(hypernym) , ,

(hyponym)

(derivation)

2. a warning serves to make you more alert to danger

(synonym)

(hypernym)

(hyponym) ,

(derivation)

3. an automatic signal (usually a sound) warning of danger

(synonym) , ,

(hypernym) , ,

(hyponym)

(derivation)

1. warn or arouse to a sense of danger or call to a state of preparedness; "The empty house alarmed him"; "We alerted the new neighbors to the high rate of burglaries"

(synonym)

(hypernym)

(hyponym)

(derivation)

1. very attentive or observant; "an alert and responsive baby is a joy"; "caught by a couple of alert cops"; "alert enough to spot the opportunity when it came"; "constantly alert and vigilant, like a sentinel on duty"

(antonym)

(similar) , , , ,

(see-also)

2. mentally responsive; "an alert mind"

(similar)

3. not unconscious; especially having become conscious; "the patient is now awake and alert"

(synonym)

(similar)

4. (usually followed by `to') showing acute awareness; mentally perceptive; "alert to the problems"; "alive to what is going on"; "awake to the dangers of her situation"; "was now awake to the reality of his predicament"

(synonym) ,

(similar)