Definition of grind

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grind    (grnd) KEY 

VERB:
ground  (ground) KEY , grind·ing, grinds
VERB:
tr.

1. 1. To crush, pulverize, or reduce to powder by friction, especially by rubbing between two hard surfaces: grind wheat into flour.
   2. To shape, sharpen, or refine with friction: grind a lens.
2. To rub (two surfaces) together harshly; gnash: grind the teeth.
3. To bear down on harshly; crush.
4. To oppress or weaken gradually: "Laws grind the poor, and rich men rule the law" (Oliver Goldsmith).
5. 1. To operate by turning a crank: ground a hurdy-gurdy.
   2. To produce or process by turning a crank: grinding a pound of beef.
6. To produce mechanically or without inspiration: The factory grinds out a uniform product.
7. To instill or teach by persistent repetition: ground the truth into their heads.

VERB:
intr.

1. To perform the operation of grinding something.
2. To become crushed, pulverized, or powdered by friction.
3. To move with noisy friction; grate: a train grinding along rusty rails.
4. Informal To devote oneself to study or work: grinding for a test; grinding away at housework.
5. Slang To rotate the pelvis erotically, as in the manner of a stripteaser.

NOUN:

1. The act of grinding.
2. A crunching or grinding noise.
3. A specific grade or degree of pulverization, as of coffee beans: drip grind.
4. Informal A laborious task, routine, or study: the daily grind.
5. Informal A student who works or studies excessively.
6. Slang An erotic rotation of the pelvis.

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ETYMOLOGY:
Middle English grinden, from Old English grindan; see ghrendh- in Indo-European roots

OTHER FORMS:
grinding·ly(Adverb)