畳の上の水練

たたみのうえのすいれん

useless book learning; knowing the theory but being unable to put it into practice; practising swimming on a tatami mat

Meaning

n
useless book learning; knowing the theory but being unable to put it into practice; practising swimming on a tatami mat

Example sentences

コンピューターのマニュアルを読むだけでは所詮畳の上の水練だ。

Just reading a computer manual is like practicing swimming on dry land.