名詞 den:

1. the habitation of wild animals
   同義詞：lair
2. a hiding place; usually a remote place used by outlaws
   同義詞：hideout, hideaway
3. a unit of 8 to 10 cub scouts
4. a room that is comfortable and secluded

1. The bears den up together during the winter.
   冬天熊一起在洞穴里冬眠。
2. The police tracked the thieves to their den.
   警察跟蹤小偷，直到他們的老窩。
3. The lion lay asleep in its den.
   獅子躺在洞里睡覺。

den

n.（名詞）
The shelter or retreat of a wild animal; a lair.
獸穴：野生動物躲避或撤退的地方；獸穴
A cave or hollow used as a refuge or hiding place.
洞穴：一個用于避難或藏身的洞穴或空洞
A hidden or squalid dwelling place:
賊窩：一個隱蔽的或骯臟的住所：
例句：
a den of thieves.
賊窩

A secluded room for study or relaxation.
書齋：一個用于學(xué)習(xí)或放松的僻靜房間
A unit of about eight to ten Cub Scouts.
幼年童子軍小隊：一種由大約八到十名幼年童子軍組成的小組
v.intr.（不及物動詞）
denned,den.ning,dens
To inhabit or hide in a den.
穴居：居住或藏在洞穴里

來源：
Middle English
中古英語
from Old English denn
源自 古英語 denn