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be on full/red alert

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be on full/red alert

if soldiers are on full alert, they know that a situation is dangerous and are prepared to act immediately if necessary. The British flagship in the area went to battle stations and remained on full alert for twenty minutes.

See also: alert, full, red

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be on bad terms with
be on best behaviour
be on case
be on cloud nine
be on course for
be on edge
be on everyone's lips

be on full/red alert
be on good terms with
be on guard
be on hand
be on hold
be on ice
be on its last legs
be on last legs

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