There are several synonyms for the phrase "cast in prison." Some of these synonyms include "incarcerated," "detained," "confined," and "imprisoned." Other synonyms for this phrase include "put in jail," "locked up," "behind bars," and "sentenced to prison." Each of these phrases conveys the same meaning, which refers to a person who has been restrained and confined to a prison cell or facility, typically as a result of committing a crime or breaking the law. Regardless of the terminology used, all of these phrases represent a significant loss of freedom for those who are incarcerated.