119 entries under maintain topic. ×

13
ensure(verb, support, secure, approve)
13
vouch for(verb, expression, phrasal verb, support, show)
12
aver(verb, support, state, show)
12
profess(verb, support, state, agree)
12
swear(verb, support, state, show)
11
avouch(verb, state, agree, allow)
11
back(verb, support, show, accept)
10
manifest(verb, state, show, determine)
10
state(verb, agree, allow, declare)
9
assert(verb, support, state, show)
8
acknowledge(verb, support, state, agree)
8
avow(verb, support, state, agree)
8
uphold(verb, support, show, accept)
7
asseverate(verb, support, state, agree)
7
insure(verb, support, secure, establish)
6
evidence(verb, support, show, determine)
6
guaranty(noun, verb, support, secure)
6
make certain(verb, expression, idiom, support)
6
make sure(verb, expression, support, secure)
6
reassure(verb, support, state, secure)
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APASmart Define. (2016). certify thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/certify/thesaurus/synonyms
ChicagoSmart Define. 2016. "certify thesaurus" https://smartdefine.org/certify/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, certify thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/certify/thesaurus/synonyms>.
MLASmart Define. "certify thesaurus" 11 January 2016. Web. 22 September 2026. <https://smartdefine.org/certify/thesaurus/synonyms>