grindata

Etymology
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Verb

 * 1)  to grind to slide a skateboard or snowboard across an obstacle
 * 2)  to grind to rotate the hips erotically
 * 3)  to grind to dance in a sexually suggestive way
 * 4)  to grind to repeat a task in video games
 * 5)  to grind to produce mechanically and repetitively as if by turning a crank
 * 6)  to grind to work or study hard