畳水練 たたみすいれん Meanings Noun useless book learning; knowing the theory but not being able to put it into practice (literally: swim practice on a tatami mat) Kanji 畳 fold. Read as たたみ. 水 water. Read as スイ. 練 practice. Read as レン. Word lists Idioms Jocular Jinuma: Japanese Dictionary · Word lists