RichThesaurus
countersign
countersign
synonyms
sign
watchword
word
witness
endorse
password
parole
initial
underwrite
certify
subscribe
validate
autograph
confirm
put one's mark on
affirm
ratify
inscribe
agree to
sanction
corroborate
chirographate
approve
set one's hand to
warrant
assent to
support
argue
bear out
accept
consent to
seal
attest
formalize
uphold
recognize
authorize
side-sign
open sesame
announce
bear witness
style
signal
give evidence
countersignature
put one's name to
superscribe
indicate
key word
give testimony
more synonyms
countersign
antonyms
reject
invalidate
revoke
deny
disapprove
refute
refuse