closet       
 noun [ C ] mainly US uk/ˈklɒz.ɪt/ us/ˈklɑː.zət/
A2 (尤指放衣服的)壁橱,壁柜,储藏室
a cupboard or a small room with a door, used for storing things, especially clothes
  a bedroom/linen/storage closet 卧室壁橱/家庭日用织品柜橱/储藏室 
 Idiom  
come out of the closetidiom  出柜,公开同性恋身份
to tell your family, friends, or the public that you are gay, after previously keeping this secret
 closet       
 verb [ T usually passive ] uk/ˈklɒz.ɪt/ us/ˈklɑː.zɪt/
 关,藏,封闭
to put yourself in a place, especially a closed space, and stay there
  Two weeks before my exams I closeted myself (away) in my room with my books and I didn't speak to anyone. 考试前两星期,我把自己关在房里读书,不跟任何人说话。 
 The president has been closeted with (= having a private meeting with) his advisers for several hours. 总统与顾问们已经密谈了好几个小时了。 
 closet       
adjective [ before noun ] uk/ˈklɒz.ɪt/ us/ˈklɑː.zət/
 私下的,秘密的,不公开的
used to refer to a belief, activity, or feeling that is kept secret from the public, usually because you are frightened of the results of it becoming known
  a closet alcoholic/smoker 不愿承认的酗酒者/吸烟者 
 Dole portrayed the president in campaign speeches as a "closet liberal". 多尔在竞选演讲中将总统描绘为“藏而不露的自由主义者”。