This is the 413th most frequent Serbian word.
наши
"Наши" means "ours" in English.
The word "наши" is used here as a possessive pronoun to indicate possession, referring to friends that belong to 'us'.
Наши пријатељи су дошли вечерас.
Our friends came this evening.
Here, "наши" serves as a standalone possessive pronoun, referring to 'our people' or 'our members' who used to win medals.
Прошло је време када су наши освајали медаље.
The time when ours won medals has passed.
In this sentence, "наши" is part of the phrase "на нашим улицама," where it modifies "улицама" to indicate possession in the locative plural case.