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.

Définition et signification de « seg » en anglais

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