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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.

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

A US lawmaker, Congressman Suhas Subramanyam, last week asked Ferguson to testify about her ties to Jeffrey Epstein.

From BBC • Mar. 30, 2026

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

From The Wall Street Journal • Mar. 27, 2026

District Judge Zahid Quraishi to unload on career prosecutors last Monday, throwing one out of the courtroom and ordering the “triumvirate” to testify under oath about their illegal leadership structure.

From Slate • Mar. 24, 2026

Blackie admitted to agents that Hale had asked him what he required to “not testify against him.”

From "Killers of the Flower Moon" by David Grann

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