/ˈprɪnsəpəl əˈfɛndər/ – Phrase
Definition: tội phạm chính, tội phạm chủ mưu.
A more thorough explanation: The term “principal offender” refers to a person who directly commits a crime or is primarily responsible for its commission. In legal terms, the principal offender is the individual who carries out the criminal act, as opposed to an accessory or an accomplice who may have assisted or participated in the crime in some way.
Example: The principal offender in the robbery case was sentenced to ten years in prison.