When a person is ordered to testify, it means they are legally required to provide evidence or answer questions in a court of law. There are several different synonyms for this phrase, including compelled to testify, subpoenaed to testify, and summoned to testify. These phrases all indicate a legal obligation to provide testimony and can be used interchangeably in most contexts. Other related terms include deposition, which refers to a formal statement given under oath outside of court, and witness stand, which is the physical location where a witness gives their testimony in court. Overall, the concept of being ordered to testify is an important part of the legal system and plays a crucial role in ensuring justice is served.