/den/
den
BrE /den/
NAmE /den/
the hidden home of some types of wild animal
a bear’s/lion’s den
(disapproving)
a place where people meet in secret, especially for some illegal or immoral activity
a den of thieves
a drinking/gambling den
He thought of New York as a den of iniquity.
(NAmE)
a room in a house where people go to relax, watch television, etc.
(old-fashioned, BrE, informal)
a room in a house where a person can work or study without being disturbed
He would often retire to his den.
a secret place, often made roughly with walls and a roof, where children play
They made themselves a den in the woods.
to beard the lion in his ˈden
to go to see an important or powerful person to tell them that you disagree with them, that you want sth, etc.
the ˈlion’s den
a difficult situation in which you have to face a person or people who are unfriendly or aggressive towards you