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Synonyms for swear up and down
verb declare the truth of something

repeat
confirm
ratify
insist
assert
maintain
profess
declare
guarantee

attest
predicate
avow
set
avouch
certify
pronounce
vouch
ice

testify
state
swear
asseverate
cinch
aver
clinch
okay
witness

nail down
cross heart
have a lock on
lock up
put on ice
rubber-stamp
say so
swear on bible

Antonyms for swear up and down

veto
deny
renounce
repudiate

disavow
reject
refute
negate

nullify
forget

Synonyms
verb state; profess

confess
affirm
avouch
acknowledge
grant

concede
proclaim
assert
admit
swear

allow
aver
maintain
declare
own up

swear on bible
cross one’s heart

Antonyms

conceal
deny
disavow
hide
repudiate
veto

ignore
refuse
contradict
condemn
dispute
dissent

reject
censure
disclaim
disown
renounce

Synonyms
verb believe

buy
maintain
okay
consider
credit
feel
regard

aver
entertain
reckon
esteem
presume
sense
judge

assume
deem
think
view
swear by
bet bottom dollar
have hunch

have sneaking suspicion
lap up
lay money on
set store by
take as gospel truth
take stock in
cross one’s heart

Antonyms

refuse
reject
ignore
disregard
disbelieve
mistrust
release

forsake
cease
desert
forget
neglect
leave
drop

let go
abandon
halt
quit
stop
cancel

Synonyms
verb declare, assert

feign
pretend
stump
affirm
confess
acknowledge
proclaim
admit
avow
claim
predicate

certify
purport
depose
avouch
confirm
own
state
spiel
croon
vouch
maintain

asseverate
dissemble
fake
aver
announce
sing
allege
spout
come out
make out
act as if

blow hot air
constate
cross heart
get off chest
get on soapbox
open up
own up
say so
soapbox
swear on bible
talk big

Antonyms

deny
conceal
disavow
disown
hide

repudiate
refuse
renounce
dispute
contradict

invalidate
reject
question
be quiet

Synonyms
verb give word that something will be done

affirm
agree
assure
vow
ensure
commit
declare
guarantee
pledge
pawn
consent
assent

subscribe
betroth
undertake
pass
plight
hock
secure
compact
accede
mortgage
warrant
covenant

underwrite
stipulate
vouch
insure
engage
bind
bargain
contract
swear
espouse
obligate
profess

answer for
string along
affiance
asservate
cross heart
live up to
say so
swear on bible
take an oath

Antonyms

deny
disavow
disapprove
dissent
protest
refuse
reject
divorce

loosen
enlarge
release
renege
break
disagree
lose
give up

let go
loose
unfasten
untie
break off
discourage

Synonyms
verb declare under oath

assert
depose
vow
testify
affirm
covenant
attest

avow
state
vouch
maintain
promise
plight
trust

warrant
rely on
swear by
depend on
give witness
have confidence in
make an affidavit

pledge oneself
say so
state under oath
swear to God
take an oath
cross one’s heart
give one’s word

Antonyms

deny
condemn

renounce
break

Synonyms
verb vouch for; give testimony

depose
assert
indicate
swear
announce
argue
declare
attest
affirm

betoken
prove
mount
certify
evince
depone
corroborate
bespeak
state

sing
show
demonstrate
warrant
witness
bear witness
token
give evidence
give facts

make evident
point to
say so
stand up for
swear to
cross one’s heart
give one’s word

Antonyms

deny
conceal
hide

veto
contradict
reject

refute
discredit

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

Antonyms

contradict
deny
disclaim
refute
reject
disavow
disapprove

desert
disprove
invalidate
refuse
repudiate
condemn
veto

renounce
discourage
break
discredit
neglect
oppose

Synonyms
verb make a solemn promise

assure
swear
promise
declare
affirm

covenant
pledge
devote
dedicate
testify

vouch
consecrate
plight
warrant
give word of honor

undertake solemnly
cross one’s heart

Antonyms

deny
misuse

disavow
break