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thermal roughening

thermal roughening
 n.— «In February, crews started blasting the sidewalks with a blowtorch—or “thermal roughening,” as they call it—to burn away the slippery top layer of stone.» —“Mayor Bloomberg orders $1M worth of repairs on sidewalk near City Hall” by Adam Lisberg New York Daily News (New York City) Apr. 14, 2008. (source: Double-Tongued Dictionary)

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