chum

1. noun /tʃʌm/

a) A friend; a pal.

I ran into an old chum from school the other day.

b) A roommate.

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.

2. verb /tʃʌm/

a) To share rooms with; 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.

b) To make friends with; to socialize.

"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...