Meaning of “testify” in the English Dictionary

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"testify" in British English

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testifyverb [ I or T ]

uk /ˈtes.tɪ.faɪ/ us /ˈtes.tə.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.

More examples

  • I can testify to the foregoing since I was actually present when it happened.
  • They were subpoenaed to testify before the judge.
  • Ten witnesses are expected to testify at the trial today.

(Definition of “testify” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"testify" in American English

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testifyverb

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)

"testify" in Business English

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testifyverb [ I or T ]

uk /ˈtestɪfaɪ/ us

LAW to make a formal statement about something, especially in a court of law:

testify that He testified that the store owner had lied when he applied for the state license.
The senator testified to the House Committee on Financial Services.

to say that something is true:

Managing people is not easy, as many new managers can testify.

Phrasal verb(s)

(Definition of “testify” from the Cambridge Business English Dictionary © Cambridge University Press)