Definitions
1.verbTo collapse heavily or helplessly."Exhausted, he slumped down onto the sofa."
2.verbTo decline or fall off in activity or performance."Real estate prices slumped during the recession."
3.verbTo slouch or droop.
4.verbTo lump; to throw together messily.
5.verbTo fall or sink suddenly through or in, when walking on a surface, as on thawing snow or ice, a bog, etc.
6.verb(slang) To cause to collapse; to hit hard; to render unsconscious; to kill.