牢 - prison, jail, hardness

precinct of a jail; vicinity of a prison

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

room for confining criminals or lunatics (Edo period)

life imprisonment

solid; strong; sturdy; durable; stout

jail; gaol; jailhouse

dungeon

jail made by placing bars across a cave entrance; cave prison

locking the barn door after the horse has bolted; doing something too late; mending the pen after the sheep are lost

Pulao (Chinese dragon)

keeping in mind; taking note of; remembering; taking to heart

dungeon; underground prison