Hypertext Webster Gateway: "Slumping"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.]
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.
The latter walk on a bottomless quag, into which
unawares they may slump. --Barrow.
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