2
sign and seal(expression, idiom, evidence)
2
sign for(verb, expression, support, maintain, secure)
2
signal(noun, verb, make, mean, show)
2
sound off(expression, maintain, declare, confirm, admit)
2
statement
2
subscribe(verb, support, back, sign, uphold)
2
subscribe to(verb, expression, support, praise, favor)
2
suggest(verb, mean, show, present, maintain)
2
swear to(expression, support, appear, guarantee, swear)
2
swear up and down(expression, idiom, state, maintain, declare)
2
testify to(verb, expression, phrasal verb, show, confirm)
2
underpin(verb, support, back, sign, uphold)
1
add up to(verb, expression, idiom, make, mean)
1
admission
1
adumbrate(verb, determine, say, indicate, suggest)
1
advance(verb, state, press, maintain, declare)
1
advocate(verb, support, state, hold, maintain)
1
affidavit
1
allegate(verb, state, maintain, tell, reveal)
1
allegation
11 years ago|13k views|share |citing 
APASmart Define. (2015). attest thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/attest/thesaurus/synonyms
ChicagoSmart Define. 2015. "attest thesaurus" https://smartdefine.org/attest/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, attest thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/attest/thesaurus/synonyms>.
MLASmart Define. "attest thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/attest/thesaurus/synonyms>