養癰遺患 [养痈遗－]

Jyutping joeng5 jung1 wai4 waan6
Pinyin yǎng yōng yí huàn

Definitions (CC-CEDICT)
  1. lit. to foster an ulcer and bequeath a calamity (idiom); tolerating budding evil can only lead to disaster
  2. to cherish a viper in one's bosom