Slump

v. i. [imp. & p. p. SLUMPED (slŭmpt, 84), p. pr. & vb. n. SLUMPING.] [Scot. slump, a dull noise produced by something falling into a hole, a marsh, a swamp. Cf. Icel. slumpa, slambōza, to be jolted suddenly.] To fall or sink suddenly through or in, when walking on a hard surface, as on snow, ice, frozen ground, a bog, &c., not strong enough to bear the person.

The latter walk on a bottomless quag, into which unawares they may slump. Barrow.

To lump; to throw into a mass.

The different groups . . . are exclusively slumped together under that sense. Sir W. Hamilton.