Slump is probably of imitative or Scandinavian origin, akin to Norwegian and Danish slumpe ('to fall, chance'), suggesting a sudden heavy fall. Older glosses in the chain include "to fall, chance", which help explain the semantic range of the modern word. Morphologically, slump is best read as imitative formation, yielding an English noun and verb shaped by both form history and later usage. In current English it functions as a noun and verb, with the sense "a sudden decline or a sagging collapse". The result is an English noun and verb whose etymology preserves the older forms while supporting the word's specialized modern meaning.