This is the 998th most frequent Danish word.
dør
"Door."
In this sentence, the word "døren" (the door) is the object of the verb "lukker" (to close). It refers to a physical door.
Jeg lukker døren.
I am closing the door.
Here, "dør" is a conjugation of the verb "at dø", which means "to die". It is used figuratively in an idiomatic expression to describe laughing intensely.
Han dør af grin.
He is dying of laughter.
In this sentence, "døren" once again refers to a physical door, described by the adjective "rød" (red).