The word 'grinding' can mean many things:

• ''Grinding is a manufacturing process that uses friction with a rough surface to wear away or smooth the surface of a work piece. See also crusher for a description of mechanisms used for grinding materials into a powder.
• Grinding'' is a form of preparing food for eating, or for use in other forms of cooking. For example, bread and pasta rely on grinding of the flour, the production of tahini (sesame seed paste) involves grinding of the seeds, ground almonds are an important ingredient in many dishes.
• Grinding is also a dancing style which involves two or more dancing partners rubbing their bodies on one another. The orthodox technique is for two persons to straddle each other's thighs, so as to facilitate the rubbing of genitals through the clothing.
• Grinding is the performing of a trick called a "grind" in various sports:
  • In skateboarding, a grind is performed when skidding the trucks against the surface. See Skateboarding trick.
  • In freestyle snowboarding, a grind is performed when on a surface other than snow, e.g. rail grinds.
  • Grinds are also performed in freestyle biking (BMX, unicycle) and aggressive skating, and with special shoes.

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