Language: Old English
Origin: denn


den [countable]
1HBA the home of some animals, for example lions or foxes
2 a place where secret or illegal activities take place:
corrupt gambling dens
a den of thieves
3SSC an enclosed and secret place where children play
4 especially American EnglishDH a room in a house where people relax, watch television etc
5DH British English old-fashioned a small room in a house where people can work, read etc without being interrupted:
Father retreated to his den.

den of iniquity

a place where activities that you think are immoral or evil happen - often used humorously:
Her mother was convinced that London was a den of iniquity.

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