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nouncondition of heightened watchfulness or preparation for action
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verbwarn or arouse to a sense of danger or call to a state of preparedness
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adjectiveengaged in or accustomed to close observationOpposite:
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adjectivementally perceptive and responsive
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adjectivequick and energetic
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nouna warning serves to make you more alert to danger
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nounan automatic signal (usually a sound) warning of danger
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