Definition of "grinder"

grinder

/ɡɹaɪn.də(ɹ)/

noun
plural grinders
1. One who grinds something, such as the teeth.
  Quotations
  Masseter hypertrophy may become apparent in persistent grinders.
  2010, A. J. Larner, A Dictionary of Neurological Signs, page 68
2. (anatomy) A molar.
3. (slang) Any tooth.
4. A power tool with a spinning abrasive disc, used for grinding, smoothing, and shaping materials, usually metal.
5. (western New England) A sandwich made on a long, cylindrical roll.
  Quotations
  It was reported that the recipes for the secret sauce and grinder sandwiches were proprietary, known only to the current president of the corporation and the former owner of the restaurant.
  1996, Michael Craig Budden, Protecting Trade Secrets under the Uniform Trade Secrets Act, Westport, Conn.: Quorum Books, page 20
6. A kitchen gadget for processing coffee, herbs etc. into small or powdered pieces.
7. The restless flycatcher (Myiagra inquieta) of Australia, which makes a noise like a scissors grinder.
8. (music, slang) A fan or performer of grindcore music.
9. (slang) A biohacker who uses cybernetic implants or biochemicals to enhance or change their own body.
  Quotations
  Rich Lee – one of the organisers of Grindfest, and the Transhumanist Party’s ‘bio-hacking adviser’ – estimates that there are around 3,000 grinders in the US, and many more bio-hackers.
  2017, Jamie Bartlett, chapter 1, in Radicals
10. (slang, dated) A student who studies hard; a swot.
11. (slang, dated) A person who coaches students for an upcoming examination.
12. (ice hockey, slang) A hard-working, physical player with limited offensive ability.
13. (lawyer slang) A low-ranking attorney with no clients who works very hard.
14. (US, military, slang) An outdoor space for drills and parades.
  Quotations
  We were told then and there that we wouldn't be allowed on the grinder again until we could do a lot better. The grinder is what that large area was called, and it was a fitting name. They literally ground us down on it.
  2019, Chas Romeo, U.S.M.C.
  Company formations are held on the grinder (basketball court outside the Quarterdeck).
  2013, USMC Tactical Combat Casualty Care (TCCC / TC3) Guidelines
15. (radio, informal) Atmospheric interference producing a roaring background noise.