勾连 | gōu lián | to be linked together / to be involved with / to collude / interconnection / involvement / collusion | |
伙同 | huǒ tóng | to collude / in collusion with | |
沆瀣一气 | hàng xiè yī qì | to act in collusion (idiom) / in cahoots with / villains will look after one another | |
串通一气 | chuàn tōng yī qì | to act in collusion (idiom) |