/ˈsɑləˌtɛri sɛl/ – Phrase
Definition: phòng biệt giam.
A more thorough explanation: A solitary cell is a secure and confined area within a correctional facility where an inmate is isolated from other inmates and confined to the cell for a significant portion of the day as a form of punishment or for disciplinary reasons.
Example: The prisoner was placed in a solitary cell as a disciplinary measure for violating prison regulations.