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Hi

In prison two guys sat crouched in a corner naked while men scrubbed them raw with stiff brushes that felt steel-tipped.

What does "raw" mean in this case?
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Newguest men scrubbed them raw with stiff brushes
"Raw skin" is skin whose outer layer has been removed or damaged, leaving the tender "under part" exposed. The condition is usually very painful.

(I suppose "under part" is a "nonce word.")
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hi

So they scrubbed them so hard that they actually scratched their skin?
NewguestSo they scrubbed them so hard that they actually scratched their skin?
Yes.