This idiom means ruining something by adding unnecessary details.
Chǔguó yǒu jǐ gè rén dédào yì hú jiǔ
楚国Chǔguó🔊有yǒu🔊几个人jǐ gè rén🔊得到dédào🔊一壶yì hú🔊酒jiǔ🔊。
Jiǔ bùgòu dàjiā fēn jiù yuēdìng bǐsài huà shé
酒Jiǔ🔊不够bùgòu🔊大家dàjiā🔊分fēn🔊，就jiù🔊约定yuēdìng🔊比赛bǐsài🔊画蛇huà shé🔊。
Shuí xiān huà wán jiǔ jiù guī shuí
谁Shuí🔊先xiān🔊画完huà wán🔊，酒jiǔ🔊就jiù🔊归guī🔊谁shuí🔊。
Yí gè rén xiān huà wán le yòu gěi shé huà le jiǎo
一个人Yí gè rén🔊先xiān🔊画完了huà wán le🔊，又yòu🔊给gěi🔊蛇shé🔊画了huà le🔊脚jiǎo🔊。
Lìng yí gè rén shuō shé běnlái méiyǒu jiǎo nǐ huà de bú shì shé
另一个人Lìng yí gè rén🔊说shuō🔊：蛇shé🔊本来běnlái🔊没有méiyǒu🔊脚jiǎo🔊，你nǐ🔊画的huà de🔊不是bú shì🔊蛇shé🔊。
English Translation:
Several people in Chu obtained a pot of wine. The wine was not enough for everyone, so they agreed to compete in drawing snakes. Whoever finished first would get the wine. One person finished first, but then added feet to the snake. Another person said: "Snakes don't have feet originally, what you drew is not a snake."