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to alert
01
to warn someone of a possible danger, problem, or situation that requires their attention
Transitive: to alert sb of a danger or problem | to alert sb to a danger or problem
Example
The security system alerted the homeowners to a possible break-in with a loud alarm.
The weather service will alert residents of the approaching storm tomorrow.
alert
Example
The alert security guard spotted the intruder before they could enter the building.
She remained alert during the meeting, ready to contribute valuable insights at any moment.
02
engaged in or accustomed to close observation
03
quick and energetic
Alert
01
a warning about a danger, problem, or threat
02
an automatic signal (usually a sound) warning of danger
03
a situation where people are ready to confront a threat
Example
The soldiers were placed on high alert as intelligence suggested an imminent attack from enemy forces.
The city declared a state of emergency and put all emergency response teams on alert following the earthquake.

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