alert
/əˈlɜːt/
/əˈlɝt/
/əˈlɝt/
noun
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An alarm.
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A notification of higher importance than an advisory.
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A state of readiness for potential combat.
"an airborne alert; ground alert"
adjective
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Attentive; awake; on guard.
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Brisk; nimble; moving with celerity.
verb
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To give warning to.