/ɪmˈpiːtʃəbl ˈwɪtnəs/ – Phrase
Definition: 1. nhân chứng có lời khai có thể bị nghi vấn;
2. chứng cứ có thể bị nghi ngờ.
A more thorough explanation: An impeachable witness is a witness whose credibility or truthfulness can be called into question or challenged during legal proceedings, typically through the presentation of contradictory evidence or prior inconsistent statements.
Example: The defense attorney argued that the witness was not credible and should be considered an impeachable witness due to inconsistencies in their testimony.