Meaning

noun a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the U

noun grinding tooth with a broad crown; located behind the premolars

noun machinery that processes materials by grinding or crushing

originFrom Middle English grinder, grindere, from Old English grindere (“one or that which grinds; grinder”), equivalent to grind + -er.

Etymology from Wiktionary, CC BY-SA 3.0