[藏污纳垢 / 藏污納垢, cáng wū nà gòuㄘㄤˊ ㄨ ㄋㄚˋ ㄍㄡˋ] to hide dirt, to conceal corruption (成语 saw); to shelter evil people and accept wrongdoing; aiding and abetting wicked deeds#65295
[绵里藏针 / 綿里藏針, mián lǐ cáng zhēnㄇㄧㄢˊ ㄌㄧˇ ㄘㄤˊ ㄓㄣ] lit. a needle concealed in silk floss (成语 saw); fig. ruthless character behind a gentle appearance; a wolf in sheep's clothing; an iron fist in a velvet glove#99770