A large cave.
A large, dark place or space.
An underground chamber.
To put into a cavern.
To form a cavern or deep depression in.
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.
Synonym of fort (“structure improvised from furniture, etc. for playing games.”)
A comfortable room not used for formal entertaining.
A group of Cub Scouts of the same age who work on projects together.
A squalid or wretched place; a haunt.
To ensconce or hide oneself in (or as in) a den.