What does it mean to teach fish to swim?

[Idiom explanation] Lu Ban dances the axe before. Showing off one's skills in front of experts.

[Allusions Source] Chapter 52 of Li Qingru's "Mirror Flower Edge": How dare my sister play tricks on me and talk nonsense with him?

Sister, how dare I dance axe in front of Lu Ban and talk nonsense with him?

[Synonym] Bugulemen, make people laugh, generous.

[Antonym] Open-minded, self-aware and knowledgeable.

[useful] useful

[Emotional color] A derogatory term

[Grammatical Usage] Used as predicate, attribute, adverbial and object; With derogatory meaning, the expression ability is not as good as that of people.

[Idiom structure] A little formal

[Date of birth] Ancient times

Extended data:

Synonym: Make people laugh and be generous.

[Idiom explanation] Make people laugh: Make people laugh; Generosity: originally refers to people who know the avenue, and later refers to people who have knowledge or expertise. Make the insiders laugh.

[Allusions] "Zhuangzi Qiushui": "My parents laugh at their home."

I will always be laughed at by people who understand.

Laugh generously, laugh generously.

[useful] useful

[emotional color] commendatory term

[Grammatical Usage] Used as predicate, object and attribute; With a derogatory meaning, used for modesty.

[Idiom structure] A little formal

[Date of birth] Modern