/den; dɛn/
n
1 animal's hidden home, eg a cave 兽穴; 窝（如山洞）
*a bear's/lion's den 熊的[狮子的]洞穴.
2 (derog 贬) secret meeting-place 秘密相聚之处
*an `opium den 鸦片烟窟
* a den of thieves 贼窝.
3 (infml 口) room in a home where a person can work or study without being disturbed （家中的）私室, 书斋
*retire to one's den 回到自己的私室.
4 (idm 习语) beard the lion in his den => beard2. a den of i`niquity/`vice (often joc 常作戏谑语) a place where evil or immoral activities go on 进行罪恶活动的地方
*He thought of New York as a den of iniquity. 他认为纽约是个藏污纳垢之处.

n[C]
[Language: Old English;Origin: denn]
the home of some animals, for example lions or foxes
a place where secret or illegal activities take place
　corrupt gambling dens
　a den of thieves
an enclosed and secret place where children play
especially AmE a room in a house where people relax, watch television etc
BrE old-fashioned a small room in a house where people can work, read etc without being interrupted
　Father retreated to his den.
den of iniquity
a place where activities that you think are immoral or evil happen - often used humorously
　Her mother was convinced that London was a den of iniquity.