Etymology
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vive (interj.)
1590s (in vive le roi), from French, literally "long live ______!" It is the French equivalent of viva (q.v.). The opposite is à bas "down! down with!" Jocular phrase vive la différence in reference to the difference between men and women is recorded from 1963. Also in vive la bagatelle, literally "long live nonsense," denoting a carefree attitude to life.
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qui vive 

1726, in on the qui vive "on the alert," from French être sur le qui vive "be on the alert," from the phrase qui voulez-vous qui vive? sentinel's challenge, "whom do you wish to live?" In other words "(long) live who?" meaning "whose side are you on?" (The answer might be Vive la France, Vive le roi, etc.). From qui (from Latin qui "who") + vive, third person singular present subjunctive of vivre, from Latin vivere "to live" (see viva).

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modus vivendi (n.)

"mode of living," especially a working agreement between contending parties, 1844, Latin, literally "way of living or getting along" (see modus).

Modus vivendi is any temporary compromise that enables parties to carry on pending settlement of a dispute that would otherwise paralyse their activities. [Fowler]
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