appui /əˈpwiː/noun 3verb 1forms 4 noun3 •Clipping of point d'appui. •(no longer used) A support or supporter; a stay; a prop.If a Vine bee to climbe trees that are of any great height, there would be staies and appuies set to it, wherupon it may take hold — 1601 •(no longer used) The mutual bearing or support of the hand of the rider and the mouth of the horse through the bit and bridle. verb1 •To prop or support, e.g. by posting troops. formsappuied · appuiing · appuis · appuies