(third-person singular simple present clumps up, present participle clumping up, simple past and past participle clumped up)
"clump-up." YourDictionary, n.d. Web. 06 December 2018. <https://www.yourdictionary.com/clump-up>.
clump-up. (n.d.). Retrieved December 06th, 2018, from https://www.yourdictionary.com/clump-up
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