畳の上の水練 たたみのうえのすいれん Meanings Noun useless book learning; knowing the theory but being unable to put it into practice (literally: practising swimming on a tatami mat) Kanji 畳 fold. Read as たたみ. 上 up. Read as うえ. 水 water. Read as スイ. 練 practice. Read as レン. Word lists Idioms Jocular Jinuma: Japanese Dictionary · Word lists