- 1 [intransitive] to fall in price, value, number, etc., suddenly and by a large amount synonym drop Sales have slumped this year. slump by something Profits slumped by over 50%. slump (from something) (to something) The paper's circulation has slumped to 90,000.
- 2[intransitive] + adv./prep. to sit or fall down heavily The old man slumped down in his chair. She slumped to her knees.
NAmE//slʌmp//Verb Forms present simple I / you / we / they slump
he / she / it slumps
past simple slumped
-ing form slumping