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testify

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verb [intransitive/transitive] American English pronunciation: testify /ˈtestɪˌfaɪ/ 
Word Forms
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present tense
I/you/we/theytestify
he/she/ittestifies
present participletestifying
past tensetestified
past participletestified
  1. 1
    to make a statement about something that you saw, know, or experienced, usually in a court of law
    testify for/against someone:

    Several key witnesses have agreed to testify against Edwards.

    testify before something:

    Jordan testified before the grand jury last week.

    testify (that):

    Three people testified that they heard gunshots.

  2. 2
    to provide evidence that something exists or is true
    testify to:

    These ruins testify to the existence of Roman occupation.

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