the lair or shelter of a wild animal, esp. a predatory mammal.

a room, often secluded, in a house or apartment, designed to provide a quiet, comfortable, and informal atmosphere for conversation, reading, writing, etc.

a cave used as a place of shelter or concealment.

a squalid or vile abode or place

dens of misery.

one of the units of a cub scout pack, analogous to a patrol in the Boy Scouts.

to drive or pursue (an animal) into its den.

to kill (an animal) inside its den.

to live in or as if in a den.

noun

atelier , burrow , cave , cloister , couch , cubbyhole , haunt , hideout , hole , hotbed , lair , lodge , nest , retreat , sanctuary , sanctum , shelter , snuggery , study , entertaining family room , library , media room , playroom , recreation room , rec room , rumpus room , studio , tv room , covert , hideaway , cabin , cavern , dwelling , grotto , hollow , room , squalid resort , workroom