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

 

guardhouse

 noun
noun
BrE BrE//ˈɡɑːdhaʊs//
 
; NAmE NAmE//ˈɡɑːrdhaʊs//
 
 
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a building for soldiers who are guarding the entrance to a military camp or for keeping military prisoners in He spent 20 days in the guardhouse for answering back to a sergeant.
See the Oxford Advanced American Dictionary entry: guardhouse