Bunk

Part of speech: noun (n.)

1. A wooden case or box, which serves for a seat in the daytime and for a bed at night. [U.S.]

2. One of a series of berths or bed places in tiers.

3. A piece of wood placed on a lumberman's sled to sustain the end of heavy timbers. [Local, U.S.]

Part of speech: verb (v.)

To go to bed in a bunk; -- sometimes with in. [Colloq. U.S.] Bartlett.