Etymology

den of iniquity

Today it means: A place of immoral behavior, often of a sexual type. Full definition →

Latin spēlunca latrōnum
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The story

  1. Latin · calque ofspēlunca latrōnum
  2. English todayden of iniquity

Unclear, but probably inspired by the “den of thieves” in the KJV Bible, which is a calque of Latin spēlunca latrōnum.

Etymology from Wiktionary, CC BY-SA 4.0.