Learn how to say Qui Vive correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word qui vive:
(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
late 16th century: from French, literally ‘(long) live who?’, i.e. ‘on whose side are you?’, used as a sentry’s challenge