Definition of shack noun from the Oxford Advanced Learner's Dictionary

 

shack

 noun
noun
BrE BrE//ʃæk//
 
; NAmE NAmE//ʃæk//
 
 
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a small building, usually made of wood or metal, that has not been built well The settlement consists only of shacks; there are no roads, no water, no street lighting. Word Origin late 19th cent.: perhaps from Mexican jacal, Nahuatl xacatli ‘wooden hut’. The early sense of the verb was ‘live in a shack’ (originally a US usage).
See the Oxford Advanced American Dictionary entry: shack