/ˈprɪzən əˈfɛns/ – Phrase
Definition: 1. hành vi phạm tội trong thời gian thụ án tù;
2. hành vi phạm tội bị phạt tù giam.
A more thorough explanation: A “prison offence” refers to an offense committed by a person who is already incarcerated in a prison facility. This term typically encompasses violations of prison rules and regulations, as well as criminal acts committed within the prison premises.
Example: The defendant was charged with a serious prison offence, such as armed robbery, which carries a minimum sentence of 10 years in prison.