Queen's evidence
noun [ U ] law UK specialized uk/ˌkwiːnz ˈev.ɪ.dəns/ us/ˌkwiːnz ˈev.ə.dəns/
被控犯人提供的同犯的罪证
evidence from someone who has been accused of committing a crime, given against the people who were accused with them, in order to have their own punishment reduced
Compare: King's evidence state's evidence
turn Queen's evidence 供出同案犯的罪证;揭发其他案犯
to give evidence against someone else in this way
He was allowed to go free as a reward for turning Queen's evidence against his former accomplices.
Moore agreed to turn Queen's evidence in exchange for not being prosecuted.
One of her former associates had already turned Queen's evidence.
It was hoped he might be persuaded to turn Queen's evidence.
In the end, he escaped prosection by turning Queen's evidence.