4
vouchsafe
4
vow(verb, support, maintain, back, declare)
3
adduce(verb, evince)
3
allege(verb, state, maintain, agree, allow)
3
bless(verb, support, accept, praise, favor)
3
bond(verb, guarantee)
3
check(verb, support, show, determine, back)
3
contend(verb, support, state, maintain, back)
3
enfranchise(verb, authorize)
3
give permission(verb, expression, support, make, release)
3
give the go-ahead(verb, expression, idiom, support, release)
3
make(allow, permit, authorize)
3
pass on(verb, expression, support, release, pass)
3
present
3
pronounce(verb, support, state, accept, maintain)
3
recognize(verb, support, accept, release, pass)
3
sign and seal(expression, idiom, evidence)
3
stand up for(expression, idiom, support, state, maintain)
3
swear to(verb, expression, support, maintain, back)
3
undersign
10 years ago|13k views|share |citing 
APASmart Define. (2016). certify thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/certify/thesaurus/synonyms
ChicagoSmart Define. 2016. "certify thesaurus" https://smartdefine.org/certify/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, certify thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/certify/thesaurus/synonyms>.
MLASmart Define. "certify thesaurus" 11 January 2016. Web. 21 September 2026. <https://smartdefine.org/certify/thesaurus/synonyms>