Police Sergeant Croly deposed that when he arrived he found the deceased lying on the platform apparently dead. He had the body taken to the waiting-room pending the arrival of the ambulance. Constable 57 corroborated.
There are no more uses of "corroborate" in the book.
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The detectives looked for evidence to corroborate her story.
A blood test corroborated the doctor’s suspicion of diabetes.