/ˈtɛstɪˌfaɪɪŋ koʊ-dɪˈfɛndənt/ – Phrase
Definition: đồng bị đơn, đồng bị can cung khai.
A more thorough explanation: A testifying co-defendant refers to a person who is a co-defendant in a legal case and who agrees to provide testimony or evidence against their fellow co-defendants in exchange for a plea deal or other benefits from the prosecution.
Example: During the trial, the witness will be testifying against his co-defendant in the robbery case.