This is the 444th most frequent Icelandic word.
birt
"Published," "revealed," or "displayed."
Here, 'birt' is the past participle of the verb 'birta', used to indicate that something has been published or made available to others.
Ég birt greinina á blogginu mínu.
I published the article on my blog.
Here, 'birtust' is a conjugated form of 'birta', meaning to appear or become visible.
Ljósin birtust skyndilega.
The lights appeared suddenly.
Here, 'birtan' is derived from the noun 'birta', referring to brightness or visibility, specifically morning light in this context.