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testify against (someone or something)

To present evidence or testimony against someone or something as a witness in a trial. I refused to testify against the mob boss unless the police were able to guarantee the safety of my family. Spouses cannot be made to testify against one another.
See also: testify

testify for (someone or something)

To present evidence or testimony in favor or defense of someone or something as a witness in a trial. The doctor was asked to testify for the plaintiff in the criminal negligence lawsuit against the construction company. I agreed to testify for Daniel, since I was with him the night of the incident.
See also: testify

testify to (something)

To give sworn testimony that something is true. The doctor was asked to testify to the extent of the plaintiff's injuries in the criminal negligence lawsuit against the construction company. I was happy to testify for Daniel's whereabouts on the evening in question, as I had been with him the whole night.
See also: testify
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

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.
See also: testify

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.
See also: testify

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.
See also: testify
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

testify to

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
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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References in periodicals archive ?
"A testimony has broader policy issues and questions and information, but then we also try to get real-life examples from the institution that's testifying, and maybe even other institutions," Thaler explained.
They said Muslim sexual assault victims would hesitate to go to police if they're barred from wearing a niqab while testifying in court, the report said.
While the appeal court ordered a lower court judge to reconsider his 2008 ruling ordering the woman to reveal her face while testifying, it resisted setting a rule for all cases.
I have an email from the author basically apologizing, though the magazine has declined to publish a "correction." More recently, someone historically connected with the bank consortium that had originally funded the factoring company caused me to lose consulting opportunities, nearly six years after testifying! So, I felt it was time to disclose the "rest of the story."
A Law Enforcement Officer's Guide to Testifying in Court provides significant information and advice to members of the law enforcement community to improve their persuasive manner of performance at trials while testifying as witnesses.
Edwards' attorney, Dan Small, set off the fireworks when he said certified public accountant Laura East had lied about testifying as an expert in a federal trial in 1993.
In addition, certain "academic affiliates" of AGE had been designated as testifying experts for the United States.
(18) Second, is there any indication that the witness was not in a position to know the fact that she is testifying to?
Lustgarten, 62, who earns substantial side income testifying as an expert witness, last year lost one of his three medical licenses for "inappropriate" testimony on behalf of a patient's family in a medical malpractice case.
Testifying before a commission of elected officials, FBI and INS representatives, and over a thousand attendees at a groundbreaking forum in Seattle this fall, "Justice for All: The Aftermath of September 11th," Mohammad braved her trepidations to explain why she, her family, and all immigrant residents deserved better.
Drawing on literary and historical sources, Pike first very nicely evokes the dynamic energy and diverse population of early modern Seville, and then narrows her focus to address the interactions between candidates for Military Orders, many with at least some Jewish or Moslem ancestry, and men who made careers out of studying and testifying concerning ancestry.
He threatened to advise the judge that she was giving evidence against his advice if she insisted on testifying.