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testify

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testify against someone or something

to be a witness against someone or something. Who will testify against him in court? I cannot testify against the company I work for.

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testify for someone

to present evidence in favor of someone; to testify on someone's behalf. I agreed to testify for her at the trial. Max testified for Lefty, but they were both convicted.

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testify to something

to swear to something. I will testify to your whereabouts if you wish. I think I know what happened, but I would not testify to it.

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testify to

v.

1. To make a statement based on personal knowledge in support of some asserted fact; bear witness to something: Many astronauts have testified to the thrill of weightlessness. The witness testified to the accuracy of the defendant's story.

2. To serve as evidence: The wreckage testifies to the strength of the storm.

See also: testify