Origin of Testify
From Middle English testifien, from Old French testifier, from Latin testificārÄ«, present active infinitive of testificor (“I bear witness"), from testis (“a witness") + facere (“to make") (see -fy).
Middle English testifien from Latin testificārī testis witness trei- in Indo-European roots -ficārī -fy
From American Heritage Dictionary of the English Language, 5th Edition
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