Available Definitions:
1) n. - A wooden case or box, which serves for a seat in the daytime and for a bed at night.
2) n. - One of a series of berths or bed places in tiers.
3) n. - A piece of wood placed on a lumberman's sled to sustain the end of heavy timbers.
4) v. i. - To go to bed in a bunk; -- sometimes with in.