A national poll conducted last week attests to her popularity.
phraseattest to1.attest to sthformal to show or prove that something is true: Many studies attest to the fact that depression is becoming much more common, due to the increased pressures of modern life.The numerous books on his shelves attest to his broad range of interests.2.attest to sthformal to say that something is definitely true or that something definitely works: I know dozens of people who can attest to the treatment's effectiveness.There was no one who could attest to his innocence.■ SIMILAR TO: vouch for
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.
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.