/səˈpraɪz ˈwɪtnəs/ – Phrase
Definition: nhân chứng có lời khai gây sửng sốt cho bên đưa nhân chứng.
A more thorough explanation: A surprise witness is a witness whose identity and testimony are revealed unexpectedly during a trial, typically without prior disclosure to the opposing party.
Example: In a court case, the defense attorney was caught off guard by the prosecution’s surprise witness who provided crucial testimony.