From The Collaborative International Dictionary of English v.0.48:
Slump \Slump\, n. [Cf. D. slomp a mass, heap, Dan. slump a
quantity, and E. slump, v.t.]
The gross amount; the mass; the lump. [Scot.]
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Slump \Slump\, v. t. [Cf. Lump; also Sw. slumpa to bargain for
the lump.]
To lump; to throw into a mess.
[1913 Webster]
These different groups . . . are exclusively slumped
together under that sense. --Sir W.
Hamilton.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Slump \Slump\, v. i. [imp. & p. p. Slumped; p. pr. & vb. n.
Slumping.] [Scot. slump a dull noise produced by something
falling into a hole, a marsh, a swamp.]
1. To fall or sink suddenly through or in, when walking on a
surface, as on thawing snow or ice, partly frozen ground,
a bog, etc., not strong enough to bear the person.
[1913 Webster]
The latter walk on a bottomless quag, into which
unawares they may slump. --Barrow.
[1913 Webster]
2. To slide or slip on a declivity, so that the motion is
perceptible; -- said of masses of earth or rock.
[Webster 1913 Suppl.]
3. To undergo a slump, or sudden decline or falling off; as,
the stock slumped ten points. [Colloq.]
[Webster 1913 Suppl.]
From The Collaborative International Dictionary of English v.0.48:
Slump \Slump\, n.
1. A boggy place. [Prov. Eng. & Scot.]
[1913 Webster]
2. The noise made by anything falling into a hole, or into a
soft, miry place. [Scot.]
[1913 Webster]
3. A falling or declining, esp. suddenly and markedly; a
falling off; as, a slump in trade, in stock market prices,
in a batter's average, etc. [Colloq.]
[Webster 1913 Suppl. +PJC]