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English definition of “testify”

testify

verb [I or T]     /ˈtes.tɪ.faɪ/
C2 to speak seriously about something, especially in a law court , or to give or provide proof : [+ that] He testified that he had seen the man leaving the building around the time of the murder .Court cases, orders and decisions
(Definition of testify verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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