Reduce something to small pieces or powder by friction

• Sharpen or shape by rubbing on an abrasive surface

Move or make a harsh scraping sound due to friction

• Proceed with difficulty, rubbing or grating

Slide a skateboard or snowboard along an edge or rail

Work or study hard over a sustained period; drudge; hustle

Repeat tasks many times to reach a goal, especially in games

The act or process of grinding or sharpening by friction

The degree of fineness to which coffee is ground

Tedious, routine hard work; the daily slog

A skateboarding or snowboarding trick sliding along an edge or rail