solitary confinement

/S AA1 L AH0 T EH0 R IY0 K AH0 N F AY0 N M AH0 N T/
noun
  1. 1

    Forced isolation in a small space and the denial of contact with other persons, usually as a form of punishment for a prison inmate.

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Synonyms

Source: https://en.wiktionary.org/wiki/solitary%20confinement