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testify (v.)

late 14c., "give legal testimony, affirm the truth of, bear witness to;" of things, c. 1400, "serve as evidence of," from Anglo-French testifier, from Latin testificari "bear witness, show, demonstrate," also "call to witness," from testis "a witness" (see testament) + combining form of facere "to make" (from PIE root *dhe- "to set, put"). Biblical sense of "openly profess one's faith and devotion" is attested from 1520s. Related: Testified; testifying; testification.

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Definitions of testify from WordNet

testify (v.)
give testimony in a court of law;
Synonyms: attest / take the stand / bear witness
testify (v.)
provide evidence for;
Her behavior testified to her incompetence
Synonyms: bear witness / prove / evidence / show
From wordnet.princeton.edu