Longman Dictionary of Contemporary English homepage

Sense: 1-2
Date: 1700-1800
Origin: Probably from bunker
Sense: 3
Date: 1800-1900
Origin: bunk off
Sense: 4
Date: 1900-2000
Origin: bunkum

bunk

1 noun
     
bunk
Related topics: Furniture, Water
bunk1
1 [countable]TTTTTW a narrow bed that is attached to the wall, for example on a train or ship
2 also bunk bed [often plural]DHF one of two beds that are attached together, one on top of the other
3

do a bunk

British English informal to suddenly leave a place without telling anyone
4 [uncountable] informal nonsense [= bunkum]:
What a load of bunk!
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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