DICT.TW Dictionary Taiwan

 Slump, v. i. [imp. & p. p. Slumped p. pr. & vb. n. Slumping.]
 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.
    The latter walk on a bottomless quag, into which unawares they may slump.   --Barrow.
 2. To slide or slip on a declivity, so that the motion is perceptible; -- said of masses of earth or rock.
 3.  To undergo a slump, or sudden decline or falling off; as, the stock slumped ten points. [Colloq.]