on one's guard
IdiomsExample Sentences
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“Nature here is so strong that one has to be on one’s guard to not be absorbed by it,” wrote Dodge.
From Los Angeles Times • Feb. 16, 2023
It has sniffed at such examples as "directives" for orders, "alerted" for being put on one's guard, "dis-O.K." for withdrawing approval, "deactivate" for abolishing.
From Time Magazine Archive
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To which the other answered affirmatively and said that one must be on one's guard against him.
From The German Classics, v. 20 Masterpieces of German Literature by Various
One must be on one's guard with such as you.'
From Wilfrid Cumbermede by MacDonald, George
It is necessary also to be on one's guard against hasty assignments.
From Special Method in the Reading of Complete English Classics In the Grades of the Common School by McMurry, Charles A. (Charles Alexander)
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.