n. One who lodges or resides in the same chamber or rooms with another; a room-mate: especially applied to college students.n. Hence An intimate companion; a crony.To occupy the same room or chambers with another; be the chum of some one.To put into the same room or rooms with another; put into common quarters.Formerly, in some English prisons, to receive, as a new inmate, by a rough ceremony of initiation, beating him with staves, etc., and making him pay an entrance-fee, the whole being accompanied by masquerading and music: sometimes used with up.n. A bait, consisting usually of pieces of some oily fish, as the menhaden, commonly employed in the capture of bluefish.To fish with chum.n. In ceramics, a block upon which an unbaked vessel is fitted when attached to the lathe to be turned. See thrown-ware, under pottery.n. A tent; a dwelling.