01 n. A support or supporter; a stay; a prop.
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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.
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2.
The mutual bearing or support of the hand of the rider and the mouth of the horse through the bit and bridle.(Man.)
Phrases & compounds
Point d'appui —
A given point or body, upon which troops are formed, or by which are marched in line or column.