grinder

noun

• One who grinds something, such as the teeth.
• (anatomical) A molar.
• A power tool with a spinning abrasive disc, used for grinding, smoothing, and shaping materials, usually metal.
• A sandwich made on a long, cylindrical roll.

  "I am going to the deli to get a grinder for lunch."

• A kitchen gadget for processing coffee, herbs etc. into small or powdered pieces
• The restless flycatcher (Myiagra inquieta) of Australia, which makes a noise like a scissors grinder.
• A fan or performer of grindcore music.
• A biohacker who uses cybernetic implants or biochemicals to enhance or change their own body.
• A student who studies hard; a swot.
• A person who coaches students for an upcoming examination.
• (ice hockey slang) A hard-working, physical player with limited offensive ability.
• A low-ranking attorney with no clients who works very hard.
• An outdoor space for drills and parades.