clump up
Verb
Meaning
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.
Verb
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.