chum

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.

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.

I'll chum you down to the shops.