To jointly attest to something; to serve as a witness alongside another person in confirming the truth or authenticity of something.
Modern prefix 'co-' (Latin 'cum') + 'attest' (from Latin 'attestari' meaning 'to bear witness'). This is a legal/formal term with recent emergence.
In legal documents, you'll see 'coattested' or 'coattestant' when multiple witnesses sign together—the 'co-' prefix literally means 'together,' turning 'witness' into 'co-witness' or joint testimony!
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