Webster's English Dictionary

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dump

1. dump \'d*mp\ n [prob. fr. D domp haze, fr. MD damp] : a dull gloomy 
   state of mind : DESPONDENCY {in the ~s)X}
2. dump vb [perh. fr. D dompen to immerse, topple; akin to OE dyppan to dip 
   m more at DIP 1a: to let fall in a heap or mass  1b: to get rid of 
   unceremoniously or irresponsibly  slang  2: to knock down : BEAT  3: to 
   sell in quantity at a very low price; specif : to sell abroa d at less than 
   the market price at home 1: to fall abruptly : PLUNGE  2: to dump refuse  - 
   dump.er n
3. dump n often attrib  1a: an accumulation of refuse or other discarded 
   materials  1b: a place where such materials are dumped  2a: a quantity of 
   reserve materials accumulated at one place  2b: a place where such 
   materials are stored; esp : a place for the  temporary storage of military 
   supplies in the field 3: a disorderly, slovenly, or dilapidated place