This is the 171st most frequent Serbian word.
свом
The Serbian word "свом" is the dative or instrumental form of the reflexive possessive pronoun "свој," meaning "one's own."
In this sentence, 'свом' refers to 'his own' and agrees in gender, case, and number with 'пријатељу'.
Он је отишао свом пријатељу у посету.
He went to his friend for a visit.
Here, 'свом' indicates possession, meaning 'to her own,' and matches the dative case of 'брату'.
Она је писала свом брату о томе што се догодило.
She wrote to her brother about what happened.
In this context, 'свом' again signifies possessiveness, translated as 'her own,' and agrees with the dative case of 'послу'.