Pronunciation: /ˈtɛstəˌfaɪ əˈɡɛnst/
verb to give evidence or testimony against someone or something in a court of law
A1 I will testify against the thief in court.
A2 The witness agreed to testify against the suspect.
B1 The victim bravely testified against her attacker.
B2 The informant was willing to testify against the criminal organization.
C1 The whistleblower decided to testify against the corrupt officials.
C2 The key witness testified against the mob boss, leading to his conviction.
formal The witness was called to testify against the defendant in court.
informal I can't believe they asked me to testify against my own friend.
slang I ain't testifying against nobody, no matter what they offer me.
figurative Her actions testify against her character more than any words could.
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