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alert

/əˈlɜrt/
adjective
  1. Quick to notice and respond to things; fully awake and aware.
    • Cats are naturally alert animals, always ready to pounce.
    • She was alert during the lecture and took detailed notes.
    • The guard remained alert all night, watching for any movement.
Synonyms
vigilantwatchfulattentive
Antonyms
drowsy
noun
  1. A warning or signal of danger or a problem.
    • The fire alarm is a loud alert that tells everyone to leave the building.
    • The weather service issued a flood alert for the coastal areas.
    • He received an alert on his phone about the traffic jam ahead.
Synonyms
signalwarning
verb
  1. To warn someone about a danger or problem.
    • The lifeguard alerted the swimmers when she saw a shark fin.
    • Please alert the manager if you notice anything unusual.
    • The smoke detector alerted the family to the fire in the kitchen.
Synonyms
warnnotify
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