King's evidence
noun [ U ] UK uk/ˌkɪŋz ˈev.ɪ.dəns/ us/ˌkɪŋz ˈev.ə.dəns/
刑事被告向法院提供的对同案犯不利的证据（女王在位时则称为 Queen's evidence）
the phrase used for Queen's evidence when a king is ruling the United Kingdom
Compare: Queen's evidence state's evidence