Plural of cosignatory; multiple people who sign a document together, sharing equal responsibility for it.
From co- (together) + signatory (one who signs), from Latin signare (to mark or seal). The term evolved in legal contexts to describe multiple parties jointly endorsing contracts or agreements.
Cosignatories often appear on loans—when a parent cosigns for their child's student loan, they're legally just as responsible for repayment as the student themselves, which is why banks often ask for them when the main borrower seems risky.
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