Definition of Hostile witness:
Person who (in the courts opinion) gives adverse testimony or displays hostility or prejudice against the party which called him or her to testify. The calling party (with the courts permission) may cross-examine a hostile witness as if he or she was called by the opposing party. A hostile witness may be impeached by discrediting his or her credibility. See also adverse witness.
Meaning of Hostile witness & Hostile witness Definition