broom cupboard       
noun [ C ] UK uk/ˈbruːm ˌkʌb.əd/ /ˈbrʊm ˌkʌb.əd/ us/ˈbruːm ˌkʌb.ɚd/ (US broom closet)
 清洁用具壁橱|狭小的房间
a small room or large cupboard where cleaning equipment is kept
  I went and got a mop and bucket from the broom cupboard. 我从清洁用具壁橱拿了一个拖把和一个水桶。 
 He had to hide in the broom cupboard. 他不得不藏在一个狭小的房间里。 
 - More examples
 - The secretary works in a room the size of a broom cupboard.
 - The only open door led to a broom cupboard.
 - She found a broom cupboard stuffed with filthy and age-old cleaning utensils.
 - Broom cupboards and lifts can induce panic the minute the door won't open.