noun
plural dens
[count] the home of some kinds of wild animals
a US :an informal and comfortable room in a house
b chiefly Brit 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
Brit :a small often secret structure that children play in
US :a group of Cub Scouts - see also den mother