from
The Collaborative International Dictionary of English v.0.48
Dump \Dump\ (d[u^]mp), v. t. [imp. & p. p. {Dumped}; p. pr. &
vb. n. {Dumping}.] [OE. dumpen to throw down, fall down, cf.
Icel. dumpa to thump, Dan. dumpe to fall suddenly, rush,
dial. Sw. dimpa to fall down plump. Cf. {Dump} sadness.]
1. To knock heavily; to stump. [Prov. Eng.] --Halliwell.
[1913 Webster]
2. To put or throw down with more or less of violence; hence,
to unload from a cart by tilting it; as, to dump sand,
coal, etc. [U.S.] --Bartlett.
[1913 Webster]
{Dumping car} or {Dumping cart}, a railway car, or a cart,
the body of which can be tilted to empty the contents; --
called also {dump car}, or {dump cart}.
[1913 Webster]