{Point d'appui}, any point of support or basis of operations,
as a rallying point.
If a vine be to climb trees that are of any great
height, there would be stays and appuies set to it.
--Holland.
{Point d'appui}. [F., a point of support.] (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.