Giving formal evidence in a court of law; or speaking publicly about something you know or believe to be true.
From Latin 'testificari,' combining 'testis' (witness, literally 'third one standing by') and 'facere' (to make). Originally 'testis' came from the word for three.
The word 'testify' comes from 'testis,' and in ancient Rome, witnesses would swear on their testicles to tell the truth—that's where the body part name originally came from too!
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