turncoat witness

Definition of "turncoat witness"
  1. A witness initially thought to be favorable but turns adverse during the trial
How to use "turncoat witness" in a sentence
  1. Their case took a dramatic turn when their key witness became a turncoat witness.
  2. The prosecutor was caught off guard when their star witness emerged as a turncoat witness.
  3. Dealing with a turncoat witness can be challenging in any courtroom proceeding.

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