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Meaning:
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watchful and ready to act; quick to understand and act
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Example:
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A good watchdog is
alert and protective.
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Meaning:
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readiness; an alarm; a time when an alarm is in effect
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Example:
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Police and firefighters are always on
alert.
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Meaning:
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to warn or make aware of
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Example:
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Signs on a highway
alert drivers of hazards.
