2
bond
2
check(verb, support, show, determine, back)
2
cinch(verb, state, maintain, declare, confirm)
2
cite(verb, name, state, press, maintain)
2
clinch(verb, state, maintain, settle, declare)
2
come clean(expression, declare, acknowledge, confirm, admit)
2
confess(verb, state, maintain, declare, tell)
2
confide(declare, acknowledge, confirm, admit)
2
convince(verb, show, determine, confirm, find)
2
cosign(verb, support, maintain, secure, protect)
2
countersecure
2
countersign(verb, state, show, sign, approve)
2
cross heart(verb, expression, state, maintain, declare)
2
debunk(verb, support, back, sign, confirm)
2
declaration
2
determine(verb, show, confirm, find, say)
2
explain(verb, support, show, present, maintain)
2
finger(verb, make, show, mark, direct)
2
furnish evidence
2
give green light(expression, idiom, support, praise, favor)
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>