An archaic term for a rogue or knave; someone who acts as a companion rogue or fellow scoundrel.
From 'com-' (together) + 'rogue', meaning 'fellow rogue' or 'associate in rogueishness.' This is a fossilized compound from Early Modern English when '-com' prefixes were more productive.
This word is so obscure that it barely appears outside unabridged historical dictionaries—it's a relic of when English speakers freely combined 'com-' (fellow) with other nouns to create temporary 'com-friend,' 'com-mate,' etc., before standardizing to 'companion' and 'comrade.'
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