corroborate
verb (used with object)
to make more certain; confirm.
Used to describe an action that began in the past, has continued continuously, and is still in progress.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
"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