This is the 3050th most frequent Russian word.
знакомого
The Russian word "знакомого" means "acquaintance" (genitive or accusative singular masculine/neuter form) or "of an acquaintance."
The word 'знакомого' refers to 'an acquaintance' in the accusative singular masculine form.
Я встретил знакомого в магазине.
I met an acquaintance at the store.
Here, 'знакомого' is used in the accusative singular masculine form and means 'our male acquaintance'.
Мы говорили про одного нашего знакомого.
We talked about one of our acquaintances.
In this sentence, 'знакомого' is in the genitive singular masculine form, related to 'своего' meaning 'her' acquaintance.