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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

Past team-mates for club and country will queue up to attest to his character as a player and a person.

From BBC ● Sep. 21, 2026

Tens of thousands of comments on BookTok, a popular book community on TikTok, attest to the popularity of one of Russia's greatest novelists with the social media generation.

From Barron's ● Sep. 4, 2026

Any American sports fan can attest to the beauty of an entire stadium singing “The Star-Spangled Banner.”

From The Wall Street Journal ● Jun. 23, 2026

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

From Los Angeles Times ● May 27, 2026

He might have no windows to attest to it, but he had a watch, ticking steadily.

From "Strange the Dreamer" by Laini Taylor

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attest to

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