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What's the meaning of "rough" here?

 

I hadn’t even been listening. I could tell he was embarrassed. He hung his head a little and grabbed his gear from the locker and began to mirror my actions. For a while we were alone. The sound of the wire brushes roughing against green nylon and little pieces of metal settled into the room with a low hum.
What's the meaning of "rough" in the last sentence?
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For learning: English
Base language: English
Category: Language

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    Best Answer - Chosen by the Asker
    Wire brushes are rough - not smooth. They need to be rough to be able to clean. The author uses the word "roughing" to replace "rubbing" or "moving".

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