RichThesaurus
swear to
swear to
synonyms
affirm
certify
prove
corroborate
warrant
verify
testify to
guarantee
declare
support
assert
confirm
substantiate
asseverate
attest to
vouch for
swear up and down
throw one's weight behind
testify
uphold
witness
vow
swear
say so
give one’s word
stand up for
avow
announce
profess
bear witness to
sign for
be responsible for
bear out
promise
back up
argue
endorse
stick up for
demonstrate
attest
aver
give credence to
evince
pledge
show
maintain
answer for
assure
vow to
tell
swear to
definitions