Architecture. a surface that makes an oblique angle with another, as where the opening through a wall for a window or door widens from the window or door proper toward the face of the wall.

What is a splay cut?

Obliquely cut corners of bricks in walling, as in gables before the placing of copes, or the reveals of apertures. A Dictionary of Architecture and Landscape Architecture.

What is meaning of splaying?

1 : to cause to spread outward. 2 : to make oblique : bevel. intransitive verb. 1 : to extend apart or outward especially in an awkward manner.