/ˈpɛnɪˌtɛnʃəri ˈsɜːrvɪs/ – Phrase
Definition: (Mỹ) 1. làm việc trong trại giam;
2. chấp hành án tù (dài hạn hay chung thân).
A more thorough explanation: Penitentiary service refers to the government agency or department responsible for the administration and management of correctional facilities, including prisons and jails, as well as the supervision and rehabilitation of individuals who have been convicted of crimes and sentenced to incarceration.
Example: The defendant was sentenced to five years in the penitentiary for his involvement in the robbery.