A person who commits treason together with another person; a joint traitor.
From prefix 'co-' (together) + 'traitor' (one who betrays). The co- prefix comes from Latin and indicates a shared action or condition.
The prefix 'co-' actually tells a story of collaboration—whether it's cotractors building together or cotraitors conspiring together, it reminds us that many historical betrayals required multiple people working against a common authority.
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