/ɪmˈpjun/ – Verb
Definition: đặt vấn đề nghi vấn, tỏ thái độ không tin cậy, bác bỏ, không công nhận.
A more thorough explanation: To impugn means to challenge or attack the validity or integrity of something, such as a statement, argument, or person’s character, especially in a legal context.
Example: The defendant attempted to impugn the credibility of the witness by presenting evidence of prior inconsistent statements.