water-filled chamber (punishment)
Historical punishment method where a person is confined in a chamber that fills with water. Rare in modern usage; mainly encountered in historical or dramatic contexts.
In the Edo period, there was a punishment called mizurō (water-filled chamber).
Compound of 水 (mizu, 'water') and 牢 (rō, 'prison'). The exact historical derivation is uncertain; the term refers to a specific form of punishment.