牢 - prison, jail, hardness

life imprisonment

breaking out of prison; jailbreak

dungeon; underground prison

precinct of a jail; vicinity of a prison

jail for women (Edo period)

whipping, stone placement, and shrimp-tie bondage (three forms of Edo-period torture)

dying in prison

head of a prisoners' group (Edo period)

firm; solid; inflexible; immovable

prison guard; jailer; gaoler

(Edo-period) jail warden; jailer

jailbreak; breaking out of prison