n. 1 friend, comrade, companion; confidant(e), familiar; fellow, colleague, Colloq pal, sidekick, Chiefly Brit and Australian and New Zealand mate, Chiefly US and Canadian buddy I invited a chum of mine for the weekend
v. 2 Often, chum around. associate, Colloq pal (around) Yes, we used to chum around together in the army 3 chum up with. ally (oneself) with, be friendly with, go with, associate with, Colloq pal (up or about or around) with, US team up with Lionel chummed up with Ashley to go swimming