den
noun [ C ] uk/den/ us/den/
(FOR ANIMALS)
（动物的）巢穴，窝
the home of particular types of wild animal
(ROOM)
mainly US活动室，休闲室
a room in a house or apartment, used for activities not involving work
The kids are watching TV in the den. 孩子们正在活动室里看电视。
(FOR CHILDREN)
UK（供孩子玩耍用的）简易房，简易棚
a rough structure, usually built outside from pieces of wood, cardboard, etc., in which children play
(CRIME)
（从事秘密非法活动的）巢穴，老窝
a place where people secretly plan or take part in dishonest or illegal activities
a drug/drinking/vice den 毒品／酗酒／犯罪窝点
often humorous a den of thieves/iniquity 贼窝／魔窟