English Reference
noun · verb

den

n. · v.
US /ˈdɛn/ UK /dˈɛn/ den UK spelling den's, den's, denned

  1. 01 B2 Upper Intermediate Science

    n.the hidden home of a wild animal, like a lion or a fox.

    n.the natural habitation or retreat of a wild animal, typically a cave or hollow used for shelter and concealment.

    Simple

    The mother bear stayed inside the den with her cubs all winter.

    In context

    Field biologists discovered a wolf den concealed beneath the roots of a fallen cedar, containing evidence of recent activity.

  2. 02 B2 Upper Intermediate American English

    n.a comfortable room in a house where you can relax, watch TV, or read.

    n.a private, informal room in a residence used for relaxation, hobbies, or as a home office.

    Simple

    He spent the rainy afternoon reading a book in the den.

    In context

    The homeowners converted the small spare bedroom into a den, furnished with leather armchairs and floor-to-ceiling bookshelves.

  3. 03 C1 Advanced Literary

    n.a place where people do things that are illegal or dishonest.

    n.a place of vice or squalor, often used in the phrase 'den of iniquity' or 'den of thieves'.

    Simple

    The old warehouse had become a den for local criminals.

    In context

    The investigative report described the gambling hall as a den of corruption where local officials met in secret.

  4. 04 B2 Upper Intermediate American English

    n.a small group of Cub Scouts who meet and work on projects together.

    n.a small unit of Cub Scouts, typically consisting of children in the same grade level.

    Simple

    My son's scout den is building birdhouses this weekend.

    In context

    The den leader organized a hiking trip to help the scouts earn their first outdoor merit badges.

  5. 05 C2 Proficiency Technical Science

    v.to live in or hide in a cave or hole, usually said of animals.

    v.to live in or retreat to a den; often used in biological contexts regarding hibernation or nesting.

    Simple

    Some animals den deep underground to survive the cold winter.

    In context

    Polar bears typically den in snowdrifts along the coastal slopes to protect their offspring from the arctic winds.

    Usage

    The verb is often used intransitively when describing animal behavior.

The pack of four made a den, something that happens only a day or so before a female gives birth.

Smithsonian Magazine· 25 Aug 2026

Shortening.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Level B2 · Upper Intermediate
Frequency Common
Updated