- A friend; a pal.
#:I ran into an old chum from school the other day.
- A roommate.
#*1856 in The Knickerbocker: Or, New-York Monthly Magazine 1
#*: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.
- To make friends with; to socialize.
#*1902 Joseph Conrad, Heart of Darkness 2
#*:"I was not surprised to see somebody sitting aft, on the deck, with his legs dangling over the mud. You see I rather chummed with the few mechanics there were in that
station, whom the other pilgrims naturally despised -- on account of their imperfect manners, I suppose. This was the foreman -- a boiler-maker by trade -- a good worker...
#*1902 Ernest William Hornung, The Amateur Cracksman 3
#*:"You'll make yourself disliked on board!"
#*:"By von Heumann
#*:"But is that wise when he's the man we've got to diddle?"
#*:"The wisest thing I ever did. To have chummed up with him would have been fatal -- the common dodge."
- To room together.
#*1899 Clyde Bowman Furst, A Group of Old Authors 4
#*: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.
context|fishing A mixture of (frequently rancid) fish parts and blood, dumped into the water to attract predator fish, such as sharks.
context|fishing To cast chum into the water to attract fish.
#*1996 Frank Sargeant, The Reef Fishing Book: A Complete Anglers Guide 5
#*:Small live baitfish are effective, and they will take bits of fresh cut fish when chummed strongly.
(slang, mostly used in Quebec)
French: copain (copine)