下面提供两组搭配。

1. Queen’s/King’s evidence

Testimony provided by one criminal defendant, usu. under a promise of pardon, against another criminal defendant, also termed (when a king reigns) King’s evidence.

2. State’s evidence

Testimony provided by one criminal defendant - under a promise of immunity or reduced sentence - against another criminal defendant

表示“供出对同案不利的证据”的动词短语：

Turn state’s evidence

To cooperate with prosecutors and testify against other criminal defendants.

参考：

Black’s Law Dictionary 9th Ed