This is the 466th most frequent Croatian word.
otkrio
"Otkrio" means "discovered."
The word "otkrio" is used here to mean "discovered," referring to finding a piece of information or truth that was previously unknown.
Napokon sam otkrio gdje je skriven njen dnevnik.
I finally discovered where her diary is hidden.
In this case, "otkrio" is used to express the act of discovering or inventing a novel method or idea.
Otkrio je novu tehniku crtanja koja mu je pomogla u umjetnosti.
He discovered a new drawing technique that helped him in art.
Here, "otkrili" is the plural form related to "otkrio," and it is used to indicate the act of revealing or disclosing information.