RhymeZone: appui definitions

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Definitions of appui:

noun: (obsolete) A support or supporter; a stay; a prop.
noun: (horse-riding, obsolete) The mutual bearing or support of the hand of the rider and the mouth of the horse through the bit and bridle.
verb: (transitive, military) To support, e.g. by posting troops.
noun: Clipping of point d'appui. [(military) A given point or body upon which troops are formed, or by which they are marched in line or column.]

(Definitions from Wiktionary)