attest to

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acknowledge v.
substantiate v.
vouch v.

VERB

acknowledge

Synonyms

STRONGEST

accept agree defend endorse recognize support

STRONG

accede acquiesce allow approve certify grant own ratify uphold yield

WEAK

defer to subscribe to take an oath

Antonyms

STRONGEST

contradict decline deny disagree disapprove dispute oppose protest refuse reject renounce

STRONG

condemn disallow disavow invalidate veto

WEAK

abjure disregard forswear ignore repudiate

VERB

substantiate

Synonyms

STRONGEST

affirm confirm corroborate debunk demonstrate justify prove ratify validate verify

STRONG

actualize approve authenticate complete establish incarnate manifest materialize objectify personify realize reify support test try

WEAK

bear out check out check up try on try out

Antonyms

STRONGEST

contradict deny discredit disprove invalidate reject veto

STRONG

disapprove ignore neglect oppose refuse

WEAK

break

VERB

vouch

Synonyms

STRONG

affirm assert asseverate assure avert avow back certify confirm contend corroborate cosign declare guarantee maintain okay predicate profess prove sponsor substantiate support testify uphold verify vow warrant witness

WEAK

act as a witness answer for be responsible for bear testimony get behind give an affidavit put forth rubber-stamp say so sign for stand up for swear to swear up and down

Antonyms

STRONG

break condemn contradict deny desert disapprove disavow disclaim discourage discredit disprove invalidate neglect oppose refuse refute reject repudiate veto

WEAK

renounce

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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attest to

“Now I can attest to that as fact!”

From The Wall Street Journal ● Aug. 6, 2026

Supporters highlight that current law already demands voters attest to their citizenship under penalty of perjury, and they contend that constitutional amendments like Prop.

From Los Angeles Times ● Jul. 17, 2026

Plenty of millennials who are now adults will attest to its success.

From Los Angeles Times ● May 27, 2026

Hugo and his fellow Year 10 French students can attest to the success of this method.

From BBC ● Apr. 18, 2026

Yet fossils attest to human presence in China for over half a million years.

From "Guns, Germs, and Steel: The Fates of Human Societies" by Jared M. Diamond

attest to

Example Sentences

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