Bunk \Bunk\, n. [Cf. OSw. bunke heap, also boaring, flooring. Cf. Bunch.]

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.]

Source: Webster's Revised Unabridged Dictionary (1913)
 

Bunk \Bunk\, v. i. [imp. & p. p. Bunked; p. pr. & vb. n. Bunking.]

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

--Bartlett.

Source: Webster's Revised Unabridged Dictionary (1913)