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.
To stand upon one’s guard against Death exasperates her malice and protracts our sufferings.
From Imaginary Conversations and Poems A Selection by Landor, Walter Savage
But when one is specially invited to be candid, one is naturally set upon one's guard.
From Doctor Thorne by Trollope, Anthony
It is well to be upon one's guard.
From Old Kensington by Thackeray, Miss
Still, one must be always upon one's guard!
From Up the Hill and Over by Mackay, Isabel Ecclestone
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
