verb (used with object)
to drop or let fall in a mass; fling down or drop heavily or suddenly: Dump the topsoil here.
to empty out, as from a container, by tilting or overturning.
to unload or empty out (a container), as by tilting or overturning.
to be dismissed, fired, or released from a contract: The first baseman was dumped from the team after hitting .210 for the first half of the season.
to transfer or rid oneself of suddenly and irresponsibly: Don't dump your troubles on me!
Boxing Slang.
to knock down: The champion was dumped twice but won the fight.
to lose (a match) intentionally: a bribe to dump a fight.
to put (goods or securities) on the market in large quantities and at a low price without regard to the effect on market conditions.
to sell (goods) into foreign markets below cost in order to promote exports or damage foreign competition.
Computers. to print, display, or record on an output medium (the contents of a computer's internal storage or the contents of a file), often at the time a program fails.
Slang. to kill; murder: threats to dump him if he didn't pay up.
verb (used without object)
to fall or drop down suddenly.
to throw away or discard garbage, refuse, etc.
to offer goods for sale in large quantities at a low price.
to dump below-cost goods into foreign markets.
to release contents: a sewage pipe that dumps in the ocean.
Slang. to complain, criticize, gossip, or tell another person one's problems: He calls me up just to dump.
Slang: Vulgar. to defecate.
an accumulation of discarded garbage, refuse, etc.
Also called dumpsite, dumping-ground. a place where garbage, refuse, etc., is deposited.
a collection of ammunition, stores, etc., deposited at some point, as near a battlefront, for distribution.
the ammunition, stores, etc., so deposited.
the act of dumping.
a runway or embankment equipped with tripping devices, from which low-grade ore, rock, etc., are dumped.
the pile of ore so dumped.
Informal. a place, house, or town that is dilapidated, dirty, or disreputable.
(in merchandising) a bin or specially made carton in which items are displayed for sale: Fifty copies of the best-selling paperback novel were in a dump near the checkout counter.
Computers. a copy of the contents of a computer's internal storage or of the contents of a file at a given instant, that is printed, displayed, or stored on an output medium.
dump on (someone), Informal.
to attack with verbal abuse; criticize harshly: Reporters never tired of dumping on certain public figures.
to unload one's problems onto (another person): You never phone me without dumping on me.

1250–1300; Middle English (in sense “to fall suddenly”) < Old Norse dumpa strike, bump; modern senses as transitive v. and noun (not known before 19th cent.) perhaps < another source, or independent expressive formation

dumper, noun
undumped, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dump1 (dʌmp)
1.  to drop, fall, or let fall heavily or in a mass
2.  (tr) to empty (objects or material) out of a container
3.  to unload, empty, or make empty (a container), as by tilting or overturning
4.  informal (tr) to dispose of
5.  (tr) to dispose of (waste, esp radioactive nuclear waste) in the sea or on land
6.  commerce
 a.  to market (goods) in bulk and at low prices
 b.  to offer for sale large quantities of (goods) on foreign markets at low prices in order to maintain a high price in the home market and obtain a share of the foreign markets
7.  (tr) to store (supplies, arms, etc) temporarily
8.  slang chiefly (US) (intr) to defecate
9.  (tr) surfing (of a wave) to hurl a swimmer or surfer down
10.  (Austral), (NZ) (tr) to compact (bales of wool) by hydraulic pressure
11.  (tr) computing to record (the contents of part or all of the memory) on a storage device, such as magnetic tape, at a series of points during a computer run
12.  a.  a place or area where waste materials are dumped
 b.  (in combination): rubbish dump
13.  a pile or accumulation of rubbish
14.  the act of dumping
15.  informal a dirty or unkempt place
16.  military a place where weapons, supplies, etc, are stored
17.  slang chiefly (US) an act of defecation
[C14: probably of Scandinavian origin; compare Norwegian dumpa to fall suddenly, Middle Low German dumpeln to duck]

dump2 (dʌmp)
obsolete a mournful song; lament
[C16: see damp]

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

c.1300, "throw down or fall with force," from a Scandinavian source (cf. Dan. dumpe, Norw. dumpa "to fall suddenly"). The sense of "unload en masse" is first recorded in Amer.Eng. 1784. Related: Dumped; dumping. The noun "place where refuse is dumped" is attested from 1865, originally of mining operations.
Meaning "act of defecating" is from 1942.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary

dumping definition

The sale of goods of one nation in the markets of a second nation at less than the price charged within the first nation. Dumping can eliminate competitors by undercutting their prices.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Slang Dictionary

dump definition

  1. tv. & in.
    to empty one's stomach; to vomit. : She turned green, and I knew she was going to dump.
  2. in.
    to defecate. (Usually objectionable. See also dump (one's) load.) : He dumped and then came back.
  3. n.
    an act of defecation. (Usually objectionable.) : He had a dump and then came back.
  4. n.
    a low or cheap establishment; a joint. : My mama didn't raise me to spend the rest of my days in a run-down dump like this.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
My guess is that the best way to solve your problem is to be diligent about
  dumping the standing water.
The scientists did not even consider where a vast majority of contaminants
  originate from which is run-off and ocean dumping.
Their grad programs appear to be a dumping ground for students who would never
  be admitted into grad programs elsewhere.
It was later discovered two other buildings were illegally dumping into that
  sewage branch.
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