Etymology

aide-de-camp

Today it means: A military officer who serves as an adjutant to a higher-ranking officer, prince or other high political dignitary. Full definition →

French aide de camp
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The story

  1. French · borrowed fromaide de camp
  2. English todayaide-de-camp

Unadapted borrowing from French aide de camp, from aide + de (“of”) + camp (“[military] camp”).

Etymology from Wiktionary, CC BY-SA 4.0.