on the qui vive en · ADV
Etymology
Partial calque of French sur le qui-vive (“in a state of heightened vigilance”).
Meanings
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In a state of heightened vigilance, especially prior to battle.
The political influence wielded by many of the court ladies, and especially by the first lady-in-waiting (mother of the present Emperor), bears a certain resemblance to that which the eunuchs wielded under the later Manchus at the court of Peking. […] And behind the 30 ladies-in-waiting there are the rank and file of female palace attendants, some 300, all of Kyoto stock—quite sufficient to keep any conscientious chamberlain on the qui vive.
1920, J[ohn] O[tway] P[ercy] Bland, “[Exhibit G.] Three Palaces.”, in Administration of Immigration Laws: Hearings before the Committee on Immigration and Naturalization: House of Representatives, Sixty-sixth Congress, Second Session: […], Washington, D.C.: Government Printing Office, →OCLC, page 373:The question of who pressed the bell that sounded in Erskine's room, in the night, was a great source of worry to Watt, for a time, and kept him awake at night, on the qui vive.
1953, Samuel Beckett, Watt, [Paris]: Olympia Press, →OCLC: