Qui vive definitions

Qui vive

1) Alert 2) French word used in English 3) On the alert
Found on https://www.crosswordclues.com/clue/qui-vive

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Qui vive

Qui` vive' (ke` vev'). [ French, from qui who + vive , present subjunctive of vivre to live.] The challenge of a French sentinel, or patrol; -- used like the English challenge: 'Who comes there?' To be on the qui vive , to be on guard; to be watchful and alert, like a sentinel.
Found on http://www.encyclo.co.uk/webster/Q/9

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qui vive

(italics)who goes there? · on the alert; watchful: Special guards were on the qui vive for trespassers.
Found on https://www.infoplease.com/dictionary/qui-vive

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