Why is there no set word that means "to tell the truth"? We have a word for telling something that is not truthful, a.k.a. to lie, but why is there no conjugatable term for telling the truth?

In Latin, the word for truth is veritas. In English, we have words like verify, which means to validate the truth of something.

So why not have a word that means to tell the truth instead of saying "tell the truth"?

I'm telling the truth.

I'm X-ing.

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    The concept is so rare that there's not been a need to invent a term. – Hot Licks Apr 7 '18 at 18:15
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    I'm voting to close this question as off-topic because, as @nohat has said, "I get pretty anxious when I see questions like this one, where there is (to my knowledge) no real answer, and ... people [are taking] this as an invitation to start coining words. I really don't feel comfortable at all with our site becoming a place where people go who want a word invented [or to invent a 'word']. While I delight in exciting new words ... – Edwin Ashworth Apr 7 '18 at 19:59
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    being invented and promulgated, I think we will rapidly lose our reputation as a place where people can get authoritative answers if many answers are not authoritative but just merely inventive." – Edwin Ashworth Apr 7 '18 at 20:00
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    Possible duplicate of Antonym for lying? – JJ for Transparency and Monica Apr 8 '18 at 16:41

There are a whole bunch of legal terms for this. All are fair game, but because we use the terms so rarely in spoken speech they sound stiff, formal, and long.

'Aver' is in the link referenced above. That's probably closest to what you ask.

'Represents' or 'warrants' (often combined into the phrase 'represents and warrants') means statement following is identified as truthful. 'Attest' also means to state something truthfully.

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