alert

Meanings

1. 1
   adj

   Awake, watchful, and quick to notice things.

   A good driver stays alert at all times.

2. 2
   verb

   To warn someone of a danger or problem.

   I alerted them to the approaching storm.

3. 3
   noun

   A warning of danger, or a state of being ready to act.

   Bombers were put on alert during the crisis.

From French alerte (“alert”), from the phrase à l'erte (“on the watch”), from Italian all'erta (“to the height”), from erta (“lookout, tower”).

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