a large farm building for storing grain or keeping animals in 谷倉；畜棚；倉房 
a hay barn 幹草棚 They live in a converted barn (= a barn that has been turned into a house). 他們住在由谷倉改成的房子裏。
a large plain ugly building 簡陋的大建築物 - (North American English)
a building in which buses, trucks, etc. are kept when not being used （公共汽車、卡車等的）車庫
Word OriginOld English bern, berern, from bere ‘barley’ + ern, ærn ‘house’.
Idioms
close, lock, etc. the barn door after the horse has escaped (North American English)
(British English close, lock, etc. the stable door after the horse has bolted)
to try to prevent or avoid loss or damage when it is already too late to do so 馬跑了才去關廄門；賊走關門，爲時已晚