wrapping (something) in a bamboo mat;  wrapping someone in a bamboo mat and throwing them into a river (unofficial Edo-period punishment)
 wrapping (something) in a bamboo mat;  wrapping someone in a bamboo mat and throwing them into a river (unofficial Edo-period punishment)
 wrapping (something) in a bamboo mat;  wrapping someone in a bamboo mat and throwing them into a river (unofficial Edo-period punishment)