point d'ap·pui /ˌpwæn(n)dæˈpwi/
Point d'ap·pui Mil. See under Appui.
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Ap·pui n.
1. A support or supporter; a stay; a prop. [Obs.]
If a vine be to climb trees that are of any great height, there would be stays and appuies set to it. --Holland.
2. Man. The mutual bearing or support of the hand of the rider and the mouth of the horse through the bit and bridle.
Point d'appui Mil. (a) A given point or body, upon which troops are formed, or by which are marched in line or column. (b) An advantageous defensive support, as a castle, morass, wood, declivity, etc. (c) any point of support or basis of operations, as a rallying point.
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