There are various synonyms for the phrase "throw jail" which refer to incarcerating someone in a prison. One such synonym is "lock-up," which can refer to the physical act of imprisoning someone as well as the facility in which they are held. Another synonym is "detain," which indicates a shorter-term confinement, such as when a suspect is held in a police station pending trial. "Imprison" is another synonym, which denotes confining someone to a correctional facility for a longer period of time. Additionally, "incarcerate" is also a synonym, which indicates to put someone into prison or jail as a punishment for a crime.