Definitions for on one's guard
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Princeton's WordNet
on guard, on one's guard(p), upon one's guard(p), on your guard(adj)
vigilant
"on guard against con artists"; "must remain on your guard in such a situation"
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"on one's guard." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/on one's guard>.

