This is the 208th most frequent Icelandic word.
eigin
"Own" or "personal."
The word 'eigin' is used here to mean 'own', emphasizing that the book belongs to the subject.
Hún skrifaði eigin bók.
She wrote her own book.
Here, 'eigin' is used to highlight personal responsibility, signifying ownership or association with 'responsibilities'.
Hann tók eigin ábyrgðir.
He took his own responsibilities.
In this sentence, 'eigin' modifies 'health' to refer to 'one's own health', giving it a possessive and individual-specific meaning.