appui in English dictionary appui Meanings and definitions of "appui" noun (obsolete) A support or supporter; a stay; a prop. noun (horse-riding) The mutual bearing or support of the hand of the rider and the mouth of the horse through the bit and bridle. more Grammar and declension of appui appui (plural appuis or appuies) more Sample sentences with "appui" Declension Stem Try again Available translations Tamil Vietnamese Authors