co-sign

Definitions of co-sign
  1. verb
    sign jointly
    “Husband and wife co-signed the lease”
    synonyms: cosign
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    type of:
    formalise, formalize, validate
    declare or make legally valid
  2. verb
    sign and endorse (another person's signature), as for a loan
    synonyms: cosign
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    type of:
    endorse, indorse
    sign as evidence of legal transfer
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