sandpaper
n. C / U B1 Intermediate US //ˈsændˌpeɪpɝ// UK //sˈændpeɪpɐ// sand·pa·per
n. a rough paper with a special surface used for smoothing wood, metal, or paint. You rub it against a surface to make it flat and smooth.
n. a sheet of paper or cloth with an abrasive material attached to one side, used for smoothing or polishing surfaces. Often categorized by grit, which determines the coarseness of the abrasive particles.
Use sandpaper to smooth the edges of the wood.
Before applying the new coat of paint, the carpenter used fine sandpaper to ensure the surface was perfectly flat.
The technician switched from coarse to fine sandpaper as the metal began to take shape, gradually refining the texture until it was ready for a protective finish.
From sand + paper.