co-sign cosign • cosignatory · · · Info · Definitions · Synonyms · Characters · · co-sign · · Text Common · · Latin · · Scripts 7 · · Length 2 · · Syllables Definitions · · · (verb) sign jointly. Synonyms: cosign. Example: "Husband and wife co-signed the lease." · · Verb Definition 1 (verb) sign and endorse (another person's signature), as for a loan. Synonyms: cosign. · · Verb Definition 2 Synonyms · · · cosign · · Synonym 1 Characters · · - hyphen-minus U+002D c latin small letter c U+0063 g latin small letter g U+0067 i latin small letter i U+0069 n latin small letter n U+006E o latin small letter o U+006F s latin small letter s U+0073