King’s evidence
noun/ˌkɪŋz ˈevɪdəns/
/ˌkɪŋz ˈevɪdəns/
[uncountable] (law)- if a criminal turns King’s evidence, they give evidence against the people who committed a crime with them ‘King's evidence’ is used when the United Kingdom has a king, and ‘Queen’s evidence’ when it has a queen.
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King’s evidence