testify to

Also found in: Legal.

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

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

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
References in periodicals archive ?
If you reach a point where you are uncomfortable or cannot testify to something the attorney wishes you to, say so--vigorously if necessary.
Technical witnesses testify to the specific and formula-driven benefits of insurance; paid $175 an hour
Weeding out bad experts, sometimes called "hired guns" for their willingness to testify to anything for a fee, is not so easy.