- 1 [intransitive] + adv./prep. to put your feet down noisily and heavily as you walk The children clumped down the stairs.
- 2[intransitive, transitive] clump (together) clump A and B (together) to come together or be brought together to form a tight group Galaxies tend to clump together in clusters.
NAmE//klʌmp//Verb Forms present simple I / you / we / they clump
he / she / it clumps
past simple clumped
-ing form clumping