This is the 648th most frequent Croatian word.
poruku
"Poruku" means "message" in English.
Here, 'poruku' appears as the direct object of 'ostaviti' (to leave). It serves a similar function, specifying what is to be left.
Molim vas, ostavite poruku nakon što zazvoni zvono.
Please leave a message after the beep.
In this sentence, 'poruku' is used as the direct object of the verb 'primiti' (to receive). It is in the accusative case, indicating the object of an action.
Primio sam poruku od prijatelja.
I received a message from a friend.
In this context, 'poruku' again acts as the direct object of the verb 'poslati' (to send), indicating the item being sent.