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 ]

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. ]

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 ]

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 ]

a. Easily broken through; boggy; marshy; swampy. [ Prov. Eng. & Colloq. U.S. ] Bartlett. [ 1913 Webster ]