chum /t͡ʃʌm/verb 5noun 5/t͡ʃuːm/ noun 1forms 3phrases 2 verb5 •To make friends; to socialize. •To cast chum into the water to attract fish.He began to chum for sharks, using whale oil and chopped whale meat. — 1983 •(Scotland, informal) To accompany.I'll chum you down to the shops. •To share rooms with someone; to live together.Henry Wotton and John Donne began to be friends when, as boys, they chummed together at Oxford, where Donne had gone at the age of twelve years. — 1899 •To lodge (somebody) with another person or people. noun5 •(old-fashioned) A friend; a pal.That made Thad think of Mark Twain, and he wondered whether the illustrious Tom Sawyer and his chum, Huckleberry Finn, had ever arranged a more fetching reception committee than this one[…] — 1919 •(US, Canada) A mixture of (frequently rancid) fish parts and blood, dumped into the water as groundbait to attract predator fish, such as sharks. •Synonym of chum salmon. •(old-fashioned) A roommate, especially in a college or university.Field had a 'chum,' or room-mate, whose visage was suggestive to the 'Sophs;' it invited experiment; it held out opportunity for their peculiar deviltry. — 1856 •A coarse mould for holding the clay while being worked on a whirler, lathe or manually.He uses a round slab of clay, which he places on top of the chum and commences to thump down around the sides. — 1920 chum /t͡ʃuːm/ noun1 •A temporary dwelling used by the nomadic Uralic reindeer herders of northwestern Siberia. formschummed · chumming · chums Phrases with chum chum inTo live with someone as chums; to bunk up or join up with someone as chums. chum upTo be friendly toward (with or to) someone, especially in an ingratiating way; to form a friendship (with).