Meaning of “slump” - Learner’s Dictionary

slump

noun [ C ] uk us /slʌmp/
FALL

a sudden fall in prices or sales:

a slump in world oil prices
ECONOMY

a period when there is very little business activity and not many jobs:

It's been the worst economic slump for 25 years.

(Definition of “slump noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)