Oxford Advanced American Dictionary

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

barn

noun
barn pronunciation English bɑːn barn pronunciation American bɑːrn
 
1 a large farm building for storing grain or keeping animals ina hay barnThey live in a converted barn (= a barn that has been turned into a house). see also Dutch barn2 a large plain ugly buildingThey live in a great barn of a house.3 (North American English) a building in which buses, trucks, etc. are kept when not being used
Idioms

close, etc. the barn door after the horse has escaped

(North American English) stable door