What is the meaning of grind?

noun

• An insignificant student who is ridiculed as being affected or boringly studious.
  • synonyms: swot, nerd, wonk, dweeb
• The grade of particle fineness to which a substance is ground.
  • usage: "a coarse grind of coffee"
• Hard monotonous routine work.
  • synonyms: drudgery, plodding, donkeywork
• The act of grinding to a powder or dust.
  • synonyms: mill, pulverization, pulverisation

verb

• Press or grind with a crushing noise.
  • synonyms: crunch, cranch, craunch
• Make a grating or grinding sound by rubbing together.
  • usage: "grate one's teeth in anger"
  • synonyms: grate
• Work hard.
  • usage: "She was digging away at her math homework"; "Lexicographers drudge all day long"
  • synonyms: labor, labour, toil, fag, travail, drudge, dig, moil
• Dance by rotating the pelvis in an erotically suggestive way, often while in contact with one's partner such that the dancers' legs are interlaced.
• Reduce to small pieces or particles by pounding or abrading.
  • usage: "grind the spices in a mortar"; "mash the garlic"
  • synonyms: mash, crunch, bray, comminute
• Created by grinding.
  • usage: "grind designs into the glass bowl"
• Shape or form by grinding.
  • usage: "grind lenses for glasses and cameras"