wall writings; graffiti on walls
Refers to writing or inscriptions on walls, including historical or modern graffiti.
古代遺跡の壁書きを調査する。
They investigate the wall writings of ancient ruins.
official notices posted on walls
Archaic term for public proclamations or legal notices displayed on walls.
江戸時代には、幕府の法令が壁書きとして掲示された。
In the Edo period, shogunate laws were posted as wall notices.
Compound of 壁 (kabe, 'wall') and 書き (kaki, 'writing'). The exact historical derivation is uncertain, but the term straightforwardly describes writing on walls.