Synonyms of cosign

1 Syllable

bless, yes, take, vouch, boost, ink, back, sign

2 Syllables

vouched, support, obey, vouching, assent, okay, favor, consent, sanction, ditto

3 Syllables

endorse, rubber-stamp, autograph, undersign, accede, guaranteeing, approve, acquiesce

4 Syllables

advocate, underwrite, signature, countenance