The method or result of representing the solid part of a building (as a wall, etc.) by a darkened area on an architectural plan; (occasionally) a pen for doing this.
Origin
Early 20th century. From French poché, past participle of pocher to sketch.
poché2
/ˈpɒʃeɪ/
Architecture
verb
[with object]To darken or fill in (walls, columns, etc.) with shading on an architectural plan.