World English Dictionary
grind (ɡraɪnd)
vb (foll by out) (often foll by down) (foll by out) (foll by out) (often foll by into) , grinds, grinding, ground
1.  to reduce or be reduced to small particles by pounding or abrading: to grind corn; to grind flour
2.  (tr) to smooth, sharpen, or polish by friction or abrasion: to grind a knife
3.  to scrape or grate together (two things, esp the teeth) with a harsh rasping sound or (of such objects) to be scraped together
4.  to speak or say (something) in a rough voice
5.  to hold down; oppress; tyrannize
6.  (tr) to operate (a machine) by turning a handle
7.  to produce in a routine or uninspired manner: he ground out his weekly article for the paper
8.  to continue to play in a dull or insipid manner: the band only ground out old tunes all evening
9.  to instil (facts, information, etc) by persistent effort: they ground into the recruits the need for vigilance
10.  informal (intr) to study or work laboriously
11.  chiefly (US) (intr) to dance erotically by rotating the pelvis (esp in the phrase bump and grind)
12.  informal laborious or routine work or study
13.  slang chiefly (US) a person, esp a student, who works excessively hard
14.  a specific grade of pulverization, as of coffee beans: coarse grind
15.  slang (Brit) the act of sexual intercourse
16.  chiefly (US) a dance movement involving an erotic rotation of the pelvis
17.  the act or sound of grinding
[Old English grindan; related to Latin frendere, Lithuanian gréndu I rub, Low German grand sand]

World English Dictionary
ground1 (ɡraʊnd)
1.  the land surface
2.  earth or soil: he dug into the ground outside his house
3.  (plural) the land around a dwelling house or other building
4.  (sometimes plural) an area of land given over to a purpose: football ground; burial grounds
5.  land having a particular characteristic: level ground; high ground
6.  matter for consideration or debate; field of research or inquiry: the lecture was familiar ground to him; the report covered a lot of ground
7.  a position or viewpoint, as in an argument or controversy (esp in the phrases give ground, hold, stand,orshift one's ground)
8.  position or advantage, as in a subject or competition (esp in the phrases gain ground, lose ground, etc)
9.  (often plural) reason; justification: grounds for complaint
10.  arts
 a.  the prepared surface applied to the support of a painting, such as a wall, canvas, etc, to prevent it reacting with or absorbing the paint
 b.  the support of a painting
 c.  the background of a painting or main surface against which the other parts of a work of art appear superimposed
11.  a.  the first coat of paint applied to a surface
 b.  (as modifier): ground colour
12.  the bottom of a river or the sea
13.  (plural) sediment or dregs, esp from coffee
14.  chiefly (Brit) the floor of a room
15.  cricket
 a.  the area from the popping crease back past the stumps, in which a batsman may legally stand
 b.  ground staff
16.  See ground bass
17.  a mesh or network supporting the main pattern of a piece of lace
18.  (US), (Canadian) electrical
 a.  a connection between an electrical circuit or device and the earth, which is at zero potential
 b.  Also called: earth a terminal to which this connection is made
19.  above ground alive
20.  below ground dead and buried
21.  break new ground to do something that has not been done before
22.  cut the ground from under someone's feet to anticipate someone's action or argument and thus make it irrelevant or meaningless
23.  informal (Brit) to the ground, down to the ground completely; absolutely: it suited him down to the ground
24.  informal get off the ground to make a beginning, esp one that is successful
25.  go to ground to go into hiding
26.  into the ground beyond what is requisite or can be endured; to exhaustion
27.  meet someone on his own ground to meet someone according to terms he has laid down himself
28.  the high ground, the moral high ground a position of moral or ethical superiority in a dispute
29.  touch ground
 a.  (of a ship) to strike the sea bed
 b.  to arrive at something solid or stable after discussing or dealing with topics that are abstract or inconclusive
30.  (modifier) situated on, living on, or used on the ground: ground frost; ground forces
31.  (modifier) concerned with or operating on the ground, esp as distinct from in the air: ground crew; ground hostess
32.  (modifier) (used in names of plants) low-growing and often trailing or spreading
33.  (tr) to put or place on the ground
34.  (tr) to instruct in fundamentals
35.  (tr) to provide a basis or foundation for; establish
36.  (tr) to confine (an aircraft, pilot, etc) to the ground
37.  informal (tr) to confine (a child) to the house as a punishment
38.  the usual US word for earth
39.  (tr) nautical to run (a vessel) aground
40.  (tr) to cover (a surface) with a preparatory coat of paint
41.  (intr) to hit or reach the ground
[Old English grund; related to Old Norse grunn shallow, grunnr, grund plain, Old High German grunt]

ground2 (ɡraʊnd)
1.  the past tense and past participle of grind
2.  having the surface finished, thickness reduced, or an edge sharpened by grinding
3.  reduced to fine particles by grinding

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. grindan, forgrindan "destroy by crushing" (class III strong verb; past tense grand, pp. grunden), from P.Gmc. *grindanan (cf. Du. grenden), related to ground, from PIE *ghrendh- "crushing" (cf. L. frendere "to gnash the teeth," Gk. khondros "corn, grain," Lith. grendu "to scrape, scratch"). The
noun sense "steady, hard work" first recorded 1851 in college student slang; the meaning "hard-working student" is Amer.Eng. slang from 1864. Grinder as a type of large sandwich is first recorded 1954. To keep one's nose to the grindstone was originally to get control of another and treat him harshly:
"This Text holdeth their noses so hard to the grindstone, that it clean disfigureth their Faces." [Frith, "Mirror to know Thyself," 1532]
The main modern (reflective) sense of "work hard" is from 1828.

O.E. grund "foundation, ground, surface of the earth," especially "bottom of the sea" (a sense preserved in run aground), from P.Gmc. *grundus, which seems to have meant "deep place" (cf. O.Fris. grund, Du. grond, Ger. Grund "ground, soil, bottom;" O.N. grunn "a shallow place, grund "field, plain," grunnr
"bottom"). No known cognates outside Gmc. Sense of "reason, motive" first attested c.1200; electrical sense is from 1870. Grounds "residue at the bottom of a liquid" (mid-14c.) is perhaps from past tense of grind (q.v.). Meaning "deny privileges" is 1940s, originally a punishment meted out to pilots (in which sense it is attested from 1931). Ground-hog is attested from 1784; Ground Hog Day first recorded 1871, Amer.Eng. Groundwork (c.1550) is originally "the solid base on which a structure is built;" fig. sense is from 1550s. Groundling "theater patron in the pit" is from c.1600, from the beginning emblematic of bad or unsophisticated taste.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
ground   (ground)  Pronunciation Key 
  1. A connection between an electrical conductor and the Earth. Grounds are used to establish a common zero-voltage reference for electric devices in order to prevent potentially dangerous voltages from arising between them and other objects. Also called earth.

  2. The set of shared points in an electrical circuit at which the measured voltage is taken to be zero. The ground is usually connected directly to the power supply and acts as a common "sink" for current flowing through the components in the circuit.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Slang Dictionary

grind definition

  1. in.
    to sell drugs. : He told the cops he wasn't grinding, but they found his junk.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Bible Dictionary

Grind definition

(Ex. 32:20; Deut. 9:21; Judg. 16:21), to crush small (Heb. tahan); to oppress the poor (Isa. 3:5). The hand-mill was early used by the Hebrews (Num. 11:8). It consisted of two stones, the upper (Deut. 24:6; 2 Sam. 11:21) being movable and slightly concave, the lower being stationary. The grinders mentioned Eccl. 12:3 are the teeth. (See MILL.)

Easton's 1897 Bible Dictionary
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