testify - definition in the American English Dictionary - Cambridge Dictionaries Online

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English definition of “testify”

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verb  us   /ˈtes·təˌfɑɪ/
to speak seriously about something, esp. to tell what you know about a case in a court of law after you have officially promised to tell the truth: [I] Elizabeth testified before a grand jury. [+ that clause] One witness testified that she saw the thief running away.
(Definition of testify from the Cambridge Academic Content Dictionary © Cambridge University Press)
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