solitary confinement
(also infml 口语作 solitary) prison punishment in which sb is kept alone in a separate cell 隔离监禁
He has been put in solitary confinement for attacking another prisoner. 他因伤害另一囚犯而被隔离监禁.
The hardened professional smuggler, on the other hand, is never troubled by such feelings, even if he has five hundred gold watches hidden in his suitcase.