From Wiktionary, the free dictionary
segja frá (weak verb, third-person singular past indicative sagði frá, supine sagt frá)
- to tell, to narrate [with dative]
Amma sagði okkur frá ferðalögum sínum í Japan.- Granny told us of her journeys in Japan.
- to tell on, to tattle [with dative]
- Synonym: kjafta