柯

Buddhism

Naraka; Hell; Hades

very bottom; the end; worst possible circumstances

奈落 only

trap room (of a theatre); below-stage basement

Formal or literary term

go (board game)

From a Chinese legend about a man who watches a game of go for so long that the handle of his axe rots away

being so engrossed in go that one loses track of time; being so engrossed in an activity that one loses track of time

Rare term

handle of an axe; handle of a hatchet