Synonyms and Antonyms for
cosign
1. cosign (v.)
sign jointly
Synonyms:
formalize
validate
co-sign
formalise
Antonyms:
invalidate
nullify
strike down
quash
break
2. cosign (v.)
sign and endorse (another person's signature), as for a loan
Synonyms:
indorse
co-sign
endorse
Antonyms:
negate
disapprove
annul
void
