n. 1. A tree or shrub trained to grow in a flat plane against a wall, often in a symmetrical pattern. 2. A trellis or other framework on which an espalier is grown. — tr.v. 1. To train as or on an espalier.
She looked up and spoke to Sabine, who was pushed back against the brick wall as if espaliered there by years of careful pruning.Ann Patchett, The Magician’s Assistant