collusion

1. N-UNCOUNT Collusion is secret or illegal cooperation, especially between countries or organizations. (尤指国家或组织间之间秘密或非法的) 串通; 勾结[正式] [usu N 'between' pl-n, N 'with' n, 'in' N]

He found no evidence of collusion between record companies and retailers. 他找不出唱片公司与零售商互相勾结的证据。