Definition of: slump

(slump) v.i.
1. To break through a crust, as of snow or ice, and sink; sink, as a foot, into any soft material.
2. To slide with perceptible motion down a declivity: said of loose earth or rock.
3. To fall or fail suddenly, as in value or quality.
4. To stand, walk, or proceed with a stooping posture; slouch: He slumps badly.
—noun
1. The act of slumping; a collapsing fall.
2. A collapse or failure; also, a sudden fall of prices: a slump in stocks.
3. A decline, as of interest, excitement, etc. [Prob. imit.]