clump up
English edit
Verb edit
clump up (third-person singular simple present clumps up, present participle clumping up, simple past and past participle clumped up)
- (transitive, intransitive) To become clumpy; to form a clump.
clump up (third-person singular simple present clumps up, present participle clumping up, simple past and past participle clumped up)