Definition of qui vive in English:

qui vive

Syllabification: qui vive
Pronunciation: /ˌkē ˈvēv
 
/

noun

(in phrase on the qui vive)
On the alert or lookout: duty requires the earnest liberal to spend most of his time on the qui vive for fascism

Origin

late 16th century: from French, literally '(long) live who?', i.e., 'on whose side are you?', used as a sentry's challenge.

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