A small cavern or hollow place in the side of a hill, or among rocks; especially, a cave used by a wild animal for shelter or concealment.
Daniel was put into the lions’ den.
A squalid or wretched place; a haunt.
a den of vice
A comfortable room not used for formal entertaining.
A narrow glen; a ravine; a dell.
To ensconce or hide oneself in (or as in) a den.
The strong odontoid process of the axis.