(third-person singular simple present chums up, present participle chumming up, simple past and past participle chummed up)
"chum-up." YourDictionary, n.d. Web. 13 October 2018. <http://www.yourdictionary.com/chum-up>.
chum-up. (n.d.). Retrieved October 13th, 2018, from http://www.yourdictionary.com/chum-up
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