獅し子しに鰭ひれ

expression

making something strong even stronger; adding fins to a lion

Rare idiomatic expression meaning to add extra power or advantage to something already formidable. The literal image is giving fins to a lion, which is already a powerful creature.

• 「獅し子しに鰭ひれ」ということわざは、強つよいものにさらに力ちからを加くわえることを意い味みする。

  The saying 'shishi ni hire' means adding even more strength to something already strong.