The structure is a clipped shortening of "segregation," removing the middle syllables to create a quicker, more casual noun. It is used to describe solitary confinement in prison, where an inmate is isolated from the general population in a separate unit with limited privileges and movement. People typically say someone is "in seg" when they have been punished for serious infractions like violence, contraband possession, or threats.

英語での「seg」の定義と意味

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