- A small cavern or hollow place in the side of a hill, or among rocks; esp., a cave used by a wild beast for shelter or concealment; as, a lion's den; a den of robbers.
- A squalid place of resort; a wretched dwelling place; a haunt; as, a den of vice."Those squalid dens, which are the reproach of great capitals." [Addison.]
- Any snug or close retreat where one goes to be alone.(Colloq)
- A narrow glen; a ravine; a dell.(Old Eng. & Scotch)
Etymology: AS. denu
Etymology: AS. denn; perh. akin to G. tenne floor, thrashing floor, and to AS. denu valley