Synonyms of corroborate

corroborate

verb

kə-ˈrä-bə-ˌrāt 

1

as in to confirm

to give evidence or testimony to the truth or factualness of

the witnesses corroborated the policeman's testimony

Synonyms & Similar Words

• confirm
• verify
• argue
• support
• validate
• prove
• vindicate
• substantiate
• attest
• authenticate
• certify
• demonstrate
• bear out
• witness
• affirm
• reinforce
• establish
• testify (to)
• assert
• guarantee
• document
• vouch (for)
• declare
• back (up)
• aver
• warrant
• profess
• avouch
• avow

Antonyms & Near Antonyms

• refute
• disprove
• rebut
• contradict
• deny
• challenge
• gainsay
• question
• dispute
• contest
• disavow
• disclaim

2

as in to reinforce

to provide evidence or information for (as a claim or idea)

my personal experience does not corroborate your faith in the essential goodness of people

Synonyms & Similar Words

• reinforce
• bolster
• prove
• support
• confirm
• substantiate
• verify
• buttress
• establish
• back
• shore (up)
• validate
• affirm
• avouch

Antonyms & Near Antonyms

• undermine
• weaken
• undercut

Synonym Chooser

How does the verb corroborate contrast with its synonyms?

Some common synonyms of corroborate are authenticate, confirm, substantiate, validate, and verify. While all these words mean "to attest to the truth or validity of something," corroborate suggests the strengthening of what is already partly established.

witnesses corroborated his story

When is it sensible to use authenticate instead of corroborate?

Although the words authenticate and corroborate have much in common, authenticate implies establishing genuineness by adducing legal or official documents or expert opinion.

handwriting experts authenticated the diaries

Where would confirm be a reasonable alternative to corroborate?

The synonyms confirm and corroborate are sometimes interchangeable, but confirm implies the removing of doubts by an authoritative statement or indisputable fact.

confirmed the reports

When is substantiate a more appropriate choice than corroborate?

The meanings of substantiate and corroborate largely overlap; however, substantiate implies the offering of evidence that sustains the contention.

the claims have yet to be substantiated

In what contexts can validate take the place of corroborate?

While in some cases nearly identical to corroborate, validate implies establishing validity by authoritative affirmation or by factual proof.

validated the hypothesis by experiments

When could verify be used to replace corroborate?

In some situations, the words verify and corroborate are roughly equivalent. However, verify implies the establishing of correspondence of actual facts or details with those proposed or guessed at.

all statements of fact in the article have been verified

Example Sentences

Recent Examples of corroborate

But no witness on his boat or in the channel at the time of the crash corroborated the claim. — David Goodhue, Miami Herald, 11 June 2026

The global secondary market hit $240 billion in transaction volume in 2025—a 48% year-over-year jump and the largest year on record, according to Jefferies—with Lazard independently corroborating a 53% surge to $233 billion. — Nick Lichtenberg, Fortune, 10 June 2026

In one incident, a cooperating witness testifying in a shooting was allegedly ambushed by gang members and made to choose between overdosing on fentanyl and being shot, an incident corroborated by witnesses including a nine-year-old girl. — Grace Zokovitch, Boston Herald, 9 June 2026

Investigators also corroborated his statements, Clark told USA TODAY on June 3. — Saleen Martin, USA Today, 5 June 2026