A person who is equally responsible with another person for paying back a debt; a joint debtor or co-obligor.
From Latin prefix 'co-' (together, with) plus English 'debtor' (from Old French 'detour,' meaning one who owes), creating a legal term.
When you co-sign a friend's loan, you become a codebtor with them—legally, you're equally guilty, which is why parents agonize so much over co-signing college loans, knowing they've just made their children's debt partly their own.
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