also: かべぞしょう
grumbling to oneself; muttering to oneself
Refers to complaining or talking to oneself, often when alone or when others are not listening. The literal meaning is 'wall lawsuit', evoking the image of arguing with a wall.
He is always grumbling to himself.
Even though no one was listening, he kept muttering to himself.
Standard kanji spelling. The reading かべぞしょう is a voiced variant, but かべそしょう is more common.
Voiced reading variant. Less common than かべそしょう.
Compound of 壁 (wall) and 訴訟 (lawsuit). The term figuratively describes the act of complaining to oneself as if arguing a case against a wall, implying that no one is listening.