collusion
n[U]
~ (with sb); ~ (between sb and sb) (fml 文) secret agreement or co-operation between two or more people with the aim of deceiving or cheating others 勾结; 串通共谋
There was collusion between the two witnesses, eg They gave the same false evidence to protect the defendant. 两个证人串通一气(如两人作同样伪证包庇被告).
She acted in collusion with the other witness. 她与另一证人串通一气.