GNU Collaborative International Dictionary of English
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Found one definition
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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.]