This is the 66th most frequent Polish word.
dwóch
"Two" (genitive form in Polish).
Here, 'dwóch' quantifies the masculine numeral for the count of brothers in the genitive case due to its numeral form.
Mam dwóch braci.
I have two brothers.
In this sentence, 'dwóch' is used to count a pair of individuals, with the noun 'ludzi' requiring the genitive case.
Spotkałem dwóch ludzi w parku.
I met two people in the park.
The word 'dwóch' here refers directly to two specific people from a group, indicating their count in situational context.