vive : Idioms & Phrases
on the qui vive
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noun lively attentiveness
sharp-sightedness; alertness.
WordNet
qui vive
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noun condition of heightened watchfulness or preparation for action
alert.
- bombers were put on alert during the crisis
WordNet
Qui` vive"
Etymology
F., fr.Definitions
The challenge of a French sentinel, or patrol; -- used like the English challenge: "Who comes there?"
Webster 1913
To be on the qui vive
- to be on guard; to be watchful and alert, like a sentinel.