on the alert


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on the alert

Particularly watchful, attentive, or prepared (for something). Security personnel are on the alert for anyone carrying suspicious-looking packages or behaving strangely. We've been on the alert ever since we heard there had been a string of burglaries in our part of town.
See also: alert, on
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

on the alert (for someone or something)

watchful and attentive for someone or something. Be on the alert for pickpockets. You should be on the alert when you cross the street in heavy traffic.
See also: alert, on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

on the alert

Watchful, fully prepared, as in The inspectors are always on the alert for a manufacturing error. [Late 1700s]
See also: alert, on
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

on the alert

Watchful and prepared for danger, emergency, or opportunity: bird watchers on the alert for a rare species.
See also: alert, on
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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