Bunk /(bŭṉk)/

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; as, to sleep in the top bunk.
3. A piece of wood placed on a lumberman's sled to sustain the end of heavy timbers. [Local, U.S.]
4. a bed. [informal]

imp. & p. p. Bunked; p. pr. & vb. n. Bunking

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