- the cave or other lair of a wild animal
- a retreat or headquarters, as of thieves; haunt
- a small, squalid room
- a small, cozy room in a house, where a person can be alone to read, work, etc.
- a small, localized unit of Cub Scouts
ME < OE denn, lair, pasture, akin to MLowG, place where grass is trodden down, lair < IE base *dhen-, level place
intransitive verb denned, denning
to live or hide in or as in a den