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

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  2. verb
    warn or arouse to a sense of danger or call to a state of preparedness
    "We alerted the new neighbors to the high rate of burglaries"

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    type of:
  3. adjective
    engaged in or accustomed to close observation
    "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"
    Opposite:
  4. adjective
    mentally perceptive and responsive
    "an alert mind" "alert to the problems"
  5. adjective
    quick and energetic
  6. noun
    a warning serves to make you more alert to danger

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    type of:
  7. noun
    an automatic signal (usually a sound) warning of danger
    type of:
Examples of alert
  • "bombers were put on alert during the crisis"
  • "We alerted the new neighbors to the high rate of burglaries"
  • "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"
  • "an alert mind"
  • "alert to the problems"
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