den /ˈdɛn/ noun
plural dens
plural dens
Learner's definition of DEN
: the home of some kinds of wild animals
see also lion's den
US : an informal and comfortable room in a house
chiefly British, informal + old-fashioned : a small and quiet room in a house where someone goes to read, work, etc.
: a secret place where people meet especially to do things that are illegal or immoral
British : a small often secret structure that children play in
US : a group of Cub Scouts see also den mother