01 n. 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 l…
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1.
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.
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2.
A squalid place of resort; a wretched dwelling place; a haunt; as, a den of vice.
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3.
Any snug or close retreat where one goes to be alone.[Colloq.]
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4.
A narrow glen; a ravine; a dell.[Old Eng. & Scotch]