(1):

(n.) A piece of wood placed on a lumberman's sled to sustain the end of heavy timbers.

(2):

(v. i.) To go to bed in a bunk; - sometimes with in.

(3):

(n.) A wooden case or box, which serves for a seat in the daytime and for a bed at night.

(4):

(n.) One of a series of berths or bed places in tiers.