- evidence given by an accomplice in a crime who becomes a voluntary witness against the other defendants: The defendants' case was lost when one of them turned state's evidence.
- evidence for the state, especially in criminal trials.
Origin of state's evidence
First recorded in 1790–1800
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- the evidence for the prosecution given on behalf of a state in a criminal prosecution
- evidence given for the state by an accomplice against his former associates in crime (esp in the phrase turn state's evidence)Brit equivalent: king's evidence, queen's evidence