attest to

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attest to

To confirm that something is true. I can attest to her whereabouts on the night of the crime—she was with me the entire time.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

attest to something

to certify or bear witness to a fact. I cannot attest to what you have reported. The witness attested to the suspect's presence at the scene of the crime.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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