verb
slumps; slumped; slumping
[no obj]
always followed by an adverb or preposition
to sit or fall down suddenly and heavily
to move down or forward suddenly
to decrease suddenly and by a large amount
noun
plural slumps
[count] a sudden decrease in prices, value, amount, etc.
a period of time when an economy is doing poorly
US sports :a period of time when a team or player is doing poorly