One of a series of berths or beds placed in tiers.

(nautical) A built-in bed on board ship, often erected in tiers one above the other.

(military) A cot.

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

(slang) Bunkum; senseless talk, nonsense.

(slang) A specimen of a recreational drug with insufficient active ingredient.

To occupy a bunk.

To provide a bunk.

(Britain) To fail to attend school or work without permission; to play truant (usually as in 'to bunk off').

(slang) To depart; scram.

(slang) Defective, broken, not functioning properly.