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has been corroborating

  • present perfect progressive
    of corroborate (3rd person singular).
    corroborate
    verb (used with object)
    to make more certain; confirm.

Example Sentences

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"What! why he has been corroborating his brother's testimony all along!" said Mr. Middleton.

From Ishmael Or, In the Depths by Emma Dorothy Eliza Nevitte Southworth