Den1. (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 lion's den; a den of robbers.
2. (n.) A squalid place of resort; a wretched dwelling place; a haunt; as, a den of vice.
3. (n.) Any snug or close retreat where one goes to be alone.
4. (n.) A narrow glen; a ravine; a dell.
5. (v. i.) To live in, or as in, a den.
Thesaurus Entries
Babylon, Gomorrah, Sodom, adytum, ashram, asylum, bolt-hole, booking office, bordello, box office, branch, branch office, brothel, burrow, cabinet, cache, cathouse, cave, cell, cesspit, cesspool, chambers, chancellery, chancery, clip joint, cloister, closet, concealment, consulate, corner, corporate headquarters, couch, cover, covert, coverture, cranny, cubby, cubbyhole, dark corner, den of iniquity, den of thieves, dive, dugout, dump, earth, embassy, executive office, fleshpots, form, foxhole, funk hole, gyp joint, headquarters, hellhole, hermitage, hideaway, hideout, hidey hole, hiding, hiding place, hole, holy of holies, home office, ivory tower, joint, lair, legation, lodge, main office, mew, niche, nook, office, pandemonium, privacy, recess, refuge, retreat, run, sanctuary, sanctum, sanctum sanctorum, secret place, shop, sink, sink of corruption, sporting house, stash, stews, study, sty, ticket office, tunnel, undercovert, whorehouse