Cosigner

noun

Definitions

Noun
  1. 1
    A cosignatory
  2. 2
    one of two or more signers of the same document (as a treaty or declaration) wordnet
  3. 3
    A person who accepts joint responsibility for the debt of another
  4. 4
    a signer in addition to the principal signer (to verify the authenticity of the principal signature or to provide surety) wordnet

Etymology

From co- + signer or cosign + -er.

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