kǒng​fū​zǐ​mén​qián​mài​wén​zhāng

to display one's slight talent before a master

孔夫子门前卖文章 孔夫子門前賣文章 kǒng​fū​zǐ​mén​qián​mài​wén​zhāng
to display one's slight talent before a master
(xiehouyu) To show off one's meager writing skills in front of Confucius, the sage of literature; used to describe someone who overestimates their ability or shows off in front of an expert.

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