yī​kē​lǎo​shǔ​shǐ​huài​le​yī​guō​tāng

one bad apple spoils the whole bunch

Senses

一颗老鼠屎坏了一锅汤/ 一顆老鼠屎壞了一鍋湯 yī​kē​lǎo​shǔ​shǐ​huài​le​yī​guō​tāng one bad apple spoils the whole bunch

One bad person or thing ruins everything else, like a single piece of rat droppings spoiling an entire pot of soup.

References

see 一颗老鼠屎坏了一锅汤/一顆老鼠屎壞了一鍋湯 一粒老鼠屎坏了一锅粥/一粒老鼠屎壞了一鍋粥