1. n. & v.
--n. colloq. (esp. among schoolchildren) a close friend.
--v.intr. (often foll. by with) share rooms.
Phrases and idioms:
chum up (often foll. by with) become a close friend (of).
Derivatives:
chummy adj. (chummier, chummiest). chummily adv. chumminess n.
Etymology: 17th c.: prob. short for chamber-fellow 2. n. & v. US
--n.
1. refuse from fish.
2 chopped fish used as bait.
--v.
1. intr. fish using chum.
2 tr. bait (a fishing place) using chum.
Etymology: 19th c.: orig. unkn.