名詞 closet:

1. a small room (or recess) or cabinet used for storage space
   同義詞：cupboard
2. a toilet in England
   同義詞：water closet, W.C., loo
3. a tall piece of furniture that provides storage space for clothes; has a door and rails or hooks for hanging clothes
   同義詞：wardrobe, press
4. a small private room for study or prayer

動詞 closet:

1. confine to a small space, as for intensive work

1. Put the coats back into the closet.
   請把大衣放回到壁櫥里。
2. Please put the coats back into the closet.
   請把大衣放回到壁櫥里。
3. You may put these books in the closet.
   你可以把這些書放在壁櫥里。

clos.et

n.（名詞）
Abbr. cl.A cabinet or enclosed recess for linens, household supplies, or clothing.
縮寫 cl.小櫥，櫥柜：放置亞麻制品、家庭用品或衣服的櫥柜或封閉的壁龕
A small private chamber, as for study or prayer.
小房間，私室：小的私人房間，如學(xué)習(xí)或祈禱用
A water closet; a toilet.
盥洗室；廁所
A state of secrecy or cautious privacy:
秘密，隱私：秘密或小心謹(jǐn)慎的狀態(tài)：
例句：
Two days before the election, the candidate suddenly came out of the closet and denounced the proposed law.
在選舉前兩天，競選人忽然打破緘默，公開譴責(zé)提議的法律

v.tr.（及物動詞）
clos.et.ed,clos.et.ing,clos.ets
To enclose or shut up in a private room, as for discussion:
關(guān)在密室中：關(guān)在密室中，如作密談：
例句：
closeted themselves with their attorneys.
和他們的律師在密室里密談

adj.（形容詞）
Private; confidential:
秘密的：秘密的；機(jī)密的：
例句：
closet information.
機(jī)密消息

Being so or engaging only in private; secret:
私下的：秘密的或僅與私人有關(guān)的；秘密的：
例句：
a closet proponent of a tax increase; a closet alcoholic.
增加稅收的私下倡議者；私下酗酒者

Based on theory and speculation rather than practice.
不實(shí)際的：建于理論和推測之上而非實(shí)踐的

來源：
Middle English [private room]
中古英語 [私人房間]
from Old French [diminutive of] clos [enclosure]
源自 古法語 [] clos的小后綴 [圍墻]
from Latin clausum [from neuter of] clausus [enclosed] * see close
源自 拉丁語 clausum [] 源自clausus的中性詞 [封閉的] *參見 close

【引伸】
clos.etful.
n.（名詞）