turn state's evidence
- A decision made by a person involved in a crime to cooperate with prosecutors and testify against other participants, usually in exchange for more lenient treatment
- When faced with a potential life sentence, he decided to turn state's evidence to lessen his charges.
- After turning state's evidence, she testified against her co-conspirators in hopes of receiving a reduced sentence.
- In order to secure a plea deal, he chose to turn state's evidence, providing crucial information about the crime.