Definitions for on the qui vive
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Princeton's WordNet
alertness, sharp-sightedness, on the qui vive(noun)
lively attentiveness
Wiktionary
on the qui vive(Adverb)
in a state of heightened vigilance, especially prior to battle
Origin: From qui vive, a sentry's challenge
Citation
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"on the qui vive." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/on the qui vive>.

