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.
see also:
slumped slumping