Dictionary

compel testimony en · VERB

To officially require that a witness appear and testify before a court of law or other public authority, under threat of legally enforceable penalties for failure to do so.
- Investigators are using "John Doe" proceedings to compel testimony from witnesses and keep them from discussing the case in public. 2011 September 19, Daniel Riemer, “Governor Walker's adversaries emboldened by Wisconsin FBI probe”, in Guardian, UK, retrieved 16 Apr 2014:
- With the power to subpoena witnesses, to compel testimony under threat of imprisonment, and to recommend criminal charges for any illegal drug activities he uncovers, Justice Dubin has been hailed here as the man who may be able to shake Canada's sporting community out of the widespread drug-taking that has been alleged. 1989 January 13, John F. Burns, “Drugs: Assessing the Johnson Debacle”, in New York Times, retrieved 16 Apr 2014:
- President Roosevelt approved an amendment to the Air Commerce Act of 1926, giving the Aeronautics Branch of the Department of Commerce power to hold public hearings, subpoena witnesses, compel testimony under oath. 1934 July 2, “Aeronautics: Causes of Crashes”, in Time, retrieved 16 Apr 2014:

Spelling	Features	Source
compelled testimony	Tense=Past, VerbForm=Part	lexicographic
compelled testimony	Tense=Past	lexicographic
compelling testimony	Tense=Pres, VerbForm=Part	lexicographic
compels testimony	Number=Sing, Person=3, Tense=Pres	lexicographic