* "The children built a cozy den out of blankets and pillows in the living room." (This uses den as a noun referring to a hiding place or a cozy area.)
* "The lion retreated to its den after the hunt." (This uses den as a noun referring to the home of an animal, particularly a wild one.)
* "The den was filled with the smell of freshly baked cookies." (This uses den as a noun referring to a room in a house, often used for relaxing or entertaining.)
* "He felt a sudden urge to den up and stay in for the rest of the day." (This uses den as a verb meaning to retreat or stay inside, typically for privacy or relaxation.)