The story of teaching fish to swim.

Lu Ban was a native of Lu during the Warring States Period. He is an expert in making exquisite instruments. People call him an "able man", and people always regard him as the ancestor of carpenters. Who dares to show off his axe skills in front of Lu Ban, that is to say, to show off his skills in front of experts? This ridiculous behavior of being too modest is referred to as "playing axe in front of Lu Ban" or "playing axe in front of Lu Ban".

Extended data:

Source:

Liu Tang Zongyuan's "Preface to the Chorus of the King": "When the axe is at the door of the class, it is strong."

Song Ouyang Xiu's Book with Mei: "There were seven or eight poems written yesterday. Today, it is ridiculous to record them. "

Example:

Mr. Wang's name is like thunder, and my younger brother is embarrassed. It's really teaching fish to swim. (Chapter 28 of Qing Wu Jingzi Scholar)

I heard that Tingting's sister is knowledgeable. How dare you teach an axe and talk nonsense with her? (Qing Li Ruzhen's "Mirror Flower Edge" back to 52)

He showed off his piano skills in front of piano master, which was really teaching fish to swim.

Quarrying a pile of soil by the river, Li Bai is famous for ages; There are poems coming and going, making a big axe in front of Lu Ban. Ming Mei Zhihuan's On Li Bais Tomb

References:

Baidu encyclopedia-teach fish to swim.