Màomíng dǐngtì shì yī zhǒng yánzhòng de qīzhà xíngwéi.
Impersonation is a serious form of fraud.
Tips
usage
冒名顶替 specifically implies using someone else's identity to take their place, often in high-stakes contexts like exams or job positions. It is a four-character idiom (成语) used in formal and legal contexts.