一顆老鼠屎壞了一鍋湯

yīkēlǎoshǔshǐhuàileyīguōtāng ㄧ ㄎㄜ ㄌㄠˇ ㄕㄨˇ ㄕˇ ㄏㄨㄞˋ ˙ㄌㄜ ㄧ ㄍㄨㄛ ㄊㄤ

    • lit. one pellet of rat feces spoiled the whole pot of soup (idiom)
    • fig. one bad apple can spoil the whole bunch

Character by character

Sources