Fell or sank heavily into a sitting position; declined or decreased suddenly.
From Low German or Scandinavian origin, possibly related to 'slump' meaning 'bog' or soft ground. The meaning evolved from physical collapse to economic decline.
The Great Slump of 2008 shows how 'slumped' moved from describing droopy postures to describing entire economies! The word perfectly captures both the physical and emotional weight of sudden decline.
Complete word intelligence in one call. Free tier — 50 lookups/day.