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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 on the alert
 保持警惕,處于戒備,提防著

From: Webster's Revised Unabridged Dictionary (1913)

 A·lert, n. Mil. An alarm from a real or threatened attack; a sudden attack; also, a bugle sound to give warning. “We have had an alert.”
 On the alert, on the lookout or watch against attack or danger; ready to act.
 

From: WordNet (r) 2.0

 on the alert
      adj : watchful and prepared for action; "bird watchers on the
            alert for a rare species"; "cops were on the job and
            caught them red-handed" [syn: on the alert(p), on
            the job(p)]