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dump (v.)

early 14c., "throw down or fall with force, drop (something or someone) suddenly," not found in Old English, perhaps from a Scandinavian source (compare Danish dumpe "fall hard," Norwegian dumpa "to fall suddenly," Old Norse dumpa "to beat").

The sense of "unload en masse, cause to fall out by tilting up a cart, etc." is recorded in American English by 1784. That of "discard, abandon" is from 1919. Economics sense of "export or throw on the market in large quantities at low prices" is by 1868. Related: Dumped; dumping. Dumping ground is by 1842.

dump (n.)

"place where refuse is dumped, pile or heap of refuse matter," 1865, originally of mining operations, from dump (v.). In reference to sites for discarding domestic trash by 1872. Dumping-ground is by 1857. Meaning "any shabby place" is from 1899. Military sense of "collection of ammunition, equipment, etc. deposited in a convenient place for later use" is by 1915. Meaning "act of defecating" is from 1942. Dump-truck is from 1930.

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Definitions of dump from WordNet
1
dump (v.)
throw away as refuse;
No dumping in these woods!
dump (v.)
sever all ties with, usually unceremoniously or irresponsibly;
She dumped her boyfriend when she fell in love with a rich man
The company dumped him after many years of service
Synonyms: ditch
dump (v.)
sell at artificially low prices;
Synonyms: underprice
dump (v.)
drop (stuff) in a heap or mass;
The truck dumped the garbage in the street
dump (v.)
fall abruptly;
Synonyms: plunge
dump (v.)
knock down with force;
Synonyms: deck / coldcock / knock down / floor
2
dump (n.)
a coarse term for defecation;
Synonyms: shit
dump (n.)
a piece of land where waste materials are dumped;
Synonyms: garbage dump / trash dump / rubbish dump / wasteyard / waste-yard / dumpsite
dump (n.)
(computer science) a copy of the contents of a computer storage device; sometimes used in debugging programs;
dump (n.)
a place where supplies can be stored;
an ammunition dump
From wordnet.princeton.edu