This is the 40th most frequent Icelandic word.
inn
"Inn" in Icelandic means "in" or "inside."
Here, 'inn' is used as an adverb to indicate movement into the interior of a place.
Ég fór inn í húsið.
I went inside the house.
In this context, 'inn' is used in a prepositional phrase to describe the location within an enclosed space.
Lyklarnir eru inn í skúffunni.
The keys are inside the drawer.
In this instance, 'inn' is used reflexively to indicate entering an enclosed space and remaining there.