I could understand
frequenting an opium DEN
The Big Bang Theory Season 5, Episode 10
It's going to be expensive
to venture into the lion's DEN, huh?
Money Heist Season 3, Episode 2
Even the little DEN of iniquity
he keeps for his meth-hag girlfriend.
Breaking Bad Season 2, Episode 2
but you're here,
in the fucking lion's DEN.
Money Heist Season 3, Episode 7
So we walk into the lion's DEN.
Game of Thrones Season 7, Episode 6