upon one's guard

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Still, one must be always upon one's guard!

From Up the Hill and Over by Mackay, Isabel Ecclestone

He had known in abundance women of courage, women of skill in dissimulation, but he remembered that when they were both beautiful and clever it was the part of wisdom to be upon one's guard.

From The Secret Witness by Gibbs, George

One grew accustomed to see an enemy in every stranger, and to be upon one's guard before a neighbor as before some lurking traitor.

From The Malady of the Century by Nordau, Max Simon

Their preoccupation spread around them an atmosphere of "constraint and ennui; one had to be upon one's guard and to check oneself."

From The Ancient Regime by Durand, John

If one don't mind what one's about, one is blown up in a moment; and to be always upon one's guard, is worse than ruin itself.

From The Wanderer (Volume 3 of 5) or, Female Difficulties by Burney, Fanny