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attest (verb) to show or prove the truth of; (law) to bear witness; say that something is true and genuine.
When you attest to something, you state that it is a fact. You attest to a person's honesty when you are able to prove that they are honest. You prove the correctness of a person's words, when you attest to them.
- The number of children who have recovered from the fatal disease as a result of his treatment attests to his competence as a doctor.
- The goals he has scored in international soccer matches attest to his greatness as a soccer champion.
- The will left by the deceased was attested by two witnesses, so it is legally enforceable.