›a sudden reduction in value, quantity, etc.: Small investors were badly hit by the stock market slump.slump in sthThere has been a 23% slump in revenue.
›ECONOMICSa period of low economic activity: The company cut over 8000 jobs during the last economic slump.The government must take drastic measures to lift the country out of this slump → Comparedepression, recession → See Noterecession