testify against (someone or something)

testify against (someone or something)

To present evidence or testimony against someone or something as a witness in a trial. I refused to testify against the mob boss unless the police were able to guarantee the safety of my family. Spouses cannot be made to testify against one another.
See also: testify
Farlex Dictionary of Idioms.

testify against someone or something

to be a witness against someone or something. Who will testify against him in court? I cannot testify against the company I work for.
See also: testify
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • get up against
  • get up against (someone or something)
  • clash
  • clash against
  • clash against (someone or something)
  • build a case against (someone or something)
  • against
  • against (someone or something)
  • gather a case against (someone or something)
  • fortify (someone or something) against (something) with (something)