collusion
noun [ U ] formal uk/kəˈluː.ʒən/ us/kəˈluː.ʒən/
勾结，共谋，串通
agreement between people to act together secretly or illegally in order to deceive or cheat someone
It is thought that they worked in collusion with the terrorist network. 人们认为他们与恐怖主义网络有勾结。