king's evidence

noun

1. （刑事被告向法庭提供的）对同案犯不利的证据（女王在位时称Queen's evidence）
   the word for Queen's evidence when the UK has a king

1. He is willing to turn king's evidence.
   他愿意提供出对同案犯不利的证据。
2. One of the arrested men, to save his own life, has turned King's Evidence.
   被捕人之一，为了自己活命，已作证告发了同伙。