互相勾结 meaning in Chinese

play into each other's hands; work hand and glove with each other; act in collusion

Theygo hand in glove , you know -
他们互相勾结,你知道
He was hand in glove with the rebels while serving in the government army
他一边在政府军中服役，一边跟叛军互相勾结。
To reduce the risk of collusion , police officers would usually be rotated to different duties , posts , squads every six months or so
警方的工作调配是每隔数月至半年便会将负责某警区或某项工作的人员转换岗位，原意是减低互相勾结或串通的可能性。