attest
definition: to authenticate, affirm to be true, genuine, or correct, as in an official capacity
example: I can attest that this is your signature.
speech part: verb
synonyms:
definition: to establish or verify the usage of
example: This word is not attested until 1993.
speech part: verb
synonyms:
definition: to provide evidence for
example: I can attest to the quality of that sandwich by showing you this graph of deliciousness.
speech part: verb
synonyms:
show
definition: to give testimony in a court of law
example: I attested to what I had seen.
speech part: verb