A dungeon is a place that's underground or hidden away, often used as a prison. Think of a dark, damp cave with cold stone walls.
The word "dungeon" is commonly used to describe a room in a castle or a medieval building where people were kept prisoner. It was usually small and uncomfortable, with no windows, making it difficult for prisoners to escape. In modern times, the word can also refer to any kind of hidden or underground space that's often cramped and gloomy. Some people might use the term "dungeon" jokingly to describe a cluttered room in their home that they never seem to clean out.
An underground prison or vault, typically built underneath a castle.
To imprison in a dungeon.
