noun
den
DEN/den/
A private sheltered dwelling or retreat.
He relaxes in the den with a book in his armchair.

Etymology
Old English denn named an animal’s sheltered hiding place. Applied to human dwellings, it came to mean a private retreat or chamber, then a small room for work or leisure.
In context
the den it's a den it's uh you can use it as a bedroom
More examples
- We spend quiet evenings reading in our den.
- The fox carries food back to its den.
- Police discover a gambling den behind the store.
Forms
den · dens