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Definitions

testify

[tes-tuh-fahy] / ˈtɛs təˌfaɪ /
VERB
vouch for; give testimony
Synonyms
STRONGEST
announce argue assert declare depose indicate swear
STRONG
affirm attest bespeak betoken certify corroborate demonstrate depone evince mount prove show sing state warrant witness
WEAK
bear witness cross one's heart give evidence give facts give one's word make evident point to say so stand up for swear to swear up and down token
Antonyms
STRONGEST
conceal deny hide
STRONG
contradict discredit refute reject veto

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.

More than 75 witnesses and about 20 experts are to testify during the proceedings, which are due to run through April.

From Barron's • Apr. 7, 2026

Witnesses flew from Brazil to testify that his ex-girlfriend, 24-year-old Ana Claudia Dos Santos, went missing in Brazil after breaking up with him.

From Los Angeles Times • Apr. 4, 2026

Gus must decide: Should she testify in Jean’s defense?

From The Wall Street Journal • Mar. 27, 2026

She added it was "long overdue" for Ferguson to volunteer to testify under oath to Congress, and also urged her to speak to police in the UK to answer their questions.

From BBC • Mar. 20, 2026

More important, they testify to levels of public authority and civic organization rarely associated with nomads.

From "1491" by Charles C. Mann

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.