1. Engaged in or accustomed to close observation (synset 300092165)
    "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"
  2. Quick and energetic (synset 300877534)
    "a brisk walk in the park"; "a lively gait"; "a merry chase"; "traveling at a rattling rate"; "a snappy pace"; "a spanking breeze"
  3. Mentally perceptive and responsive (synset 300192141)
    "an alert mind"; "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"
  1. Condition of heightened watchfulness or preparation for action (synset 114055142)
    "bombers were put on alert during the crisis"
  2. A warning serves to make you more alert to danger (synset 107239434)
  3. An automatic signal (usually a sound) warning of danger (synset 106816015)
  1. Warn or arouse to a sense of danger or call to a state of preparedness (synset 200874096)
    "The empty house alarmed him"; "We alerted the new neighbors to the high rate of burglaries"

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