Which word or phrase is mostly nearly the same in meaning as avouches?

The word "avouches" is a less common synonym for asserts, declares, or affirms.

Here's why:

* Avouches implies a strong and confident statement, often with a sense of authority.

* Asserts, declares, and affirms all convey the meaning of stating something firmly and without doubt.

So, if a sentence says someone "avouches" something, it means they are stating it with conviction and confidence.