沆瀣一氣

Simplified: 沆瀣一气

hàngxièyīqì ㄏㄤˋ ㄒㄧㄝˋ ㄧ ㄑㄧˋ

    • to act in collusion (idiom) in cahoots with
    • villains will look after one another

Character by character

Sources