Etymology

point d'appui

Today it means: A given point or body upon which troops are formed, or by which they are marched in line or column. Full definition →

French point d'appui
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The story

  1. French · borrowed frompoint d'appui“point of support”
  2. English todaypoint d'appui

From French point d'appui (“point of support”).

Etymology from Wiktionary, CC BY-SA 4.0.