attest
Definitions
To provide or serve as clear evidence of something.
To declare that something exists or is the case, typically in a formal or official capacity.
Examples
Several witnesses were called to attest to the truth of his statement.
The numerous awards on his wall attest to his dedication and hard work.
The notary had to attest the document to ensure its legal validity.
Synonyms
certify verify corroborate authenticate validate confirm vouch