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Synonyms for co signed
verb countersign a check

sign
underwrite
authenticate
notarize

subscribe
undersign
autograph
cosign

superscribe
put John Hancock on
put signature on
rubber-stamp

say amen to
sign off on
sign on dotted line
add one’s name to

Antonyms for co signed

censure
disapprove
protest

reject
oppose
repel

unauthorize

Synonyms
verb pledge, promise

insure
protect
secure
prove
support
assure
maintain
ensure
attest
certify
guaranty
angel

reassure
back
evidence
juice
evince
wager
witness
mortgage
confirm
stake
testify
endorse

aver
warrant
grubstake
bankroll
affirm
swear
answer for
vouch for
cosign
be surety for
bind oneself
get behind

give bond
make bail
make certain
make sure
pick up the check
pick up the tab
sign for
stand behind
stand up for

Antonyms

harm
injure
deny
contradict
invalidate
reject

repudiate
disprove
refute
veto
hurt
let go

neglect
discourage
oppose
break

Synonyms
verb agree

underwrite
consent
sanction
assent
back
sign
accede
acquiesce

support
favor
take
endorse
boost
okay
obey
advocate

countenance
autograph
ditto
bless
undersign
approve
signature
yes

ink
cosign
get behind
give stamp of approval give the go-ahead
go along with
hold with
put John Hancock on
rubber-stamp

Antonyms

disapprove
dissent
object
protest
refuse
prevent

veto
disallow
reject
condemn
deny
hinder

disagree
oppose
discourage
hurt

Synonyms
verb give assurance

back
corroborate
vow
sponsor
witness
guarantee
contend
uphold
prove
verify
support

certify
testify
maintain
warrant
predicate
avow
okay
avert
assert
affirm
substantiate

confirm
assure
asseverate
profess
declare
answer for
cosign
act as a witness
attest to
be responsible for
bear testimony

get behind
give an affidavit
put forth
rubber-stamp
say so
sign for
stand up for
swear to
swear up and down

Antonyms

contradict
deny
disclaim
refute
reject
disavow
disapprove

desert
disprove
invalidate
refuse
repudiate
condemn
veto

renounce
discourage
break
discredit
neglect
oppose