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grind (v.)

Old English grindan "to rub together, crush into powder, grate, scrape," forgrindan "destroy by crushing" (class III strong verb; past tense grand, past participle grunden), from Proto-Germanic *grindanan (source also of Dutch grenden), related to ground (v.), from PIE *ghrendh- "to grind" (source also of Latin frendere "to gnash the teeth," Greek khondros "corn, grain," Lithuanian grendu, gręsti "to scrape, scratch"). Meaning "to make smooth or sharp by friction" is from c. 1300. Most other Germanic languages use a verb cognate with Latin molere (compare Dutch malen, Old Norse mala, German mahlen).

grind (n.)

late Old English, "the gnashing of teeth;" c. 1200, "the act of chewing or grinding," from grind (v.). The sense "steady, hard, tedious work" first recorded 1851 in college student slang (but compare gerund-grinder, 1710); the meaning "hard-working student, one who studies with dogged application" is American English slang from 1864. Slang meaning "sexual intercourse" is by 1893.

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Definitions of grind from WordNet
1
grind (v.)
press or grind with a crushing noise;
Synonyms: crunch / cranch / craunch
grind (v.)
make a grating or grinding sound by rubbing together;
Synonyms: grate
grind (v.)
work hard;
Synonyms: labor / labour / toil / fag / travail / drudge / dig / moil
grind (v.)
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;
grind (v.)
reduce to small pieces or particles by pounding or abrading;
grind the spices in a mortar
Synonyms: mash / crunch / bray / comminute
grind (v.)
created by grinding;
grind designs into the glass bowl
grind (v.)
shape or form by grinding;
grind lenses for glasses and cameras
2
grind (n.)
an insignificant student who is ridiculed as being affected or boringly studious;
Synonyms: swot / nerd / wonk / dweeb
grind (n.)
the grade of particle fineness to which a substance is ground;
a coarse grind of coffee
grind (n.)
hard monotonous routine work;
Synonyms: drudgery / plodding / donkeywork
grind (n.)
the act of grinding to a powder or dust;
Synonyms: mill / pulverization / pulverisation
From wordnet.princeton.edu