Definitions for upon one's guard
This page provides all possible meanings and translations of the word upon one's guard
on guard, on one's guard(p), upon one's guard(p), on your guard(adj)
"on guard against con artists"; "must remain on your guard in such a situation"
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"upon one's guard." Definitions.net. STANDS4 LLC, 2014. Web. 23 Sep. 2014. <http://www.definitions.net/definition/upon one's guard>.