'To be on the qui vive' definitions:

Definition of 'To be on the qui vive'

From: GCIDE

Qui vive \Qui` vive"\ (k[-e]` v[-e]v"). [F., fr. qui who + vive, pres. subj. of vivre to live.] The challenge of a French sentinel, or patrol; -- used like the English challenge: "Who comes there?" [1913 Webster]
To be on the qui vive, to be on guard; to be watchful and alert, like a sentinel. [1913 Webster]

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