This is the 230th most frequent Czech word.
nimi
The Czech word "nimi" means "with them."
In this sentence, 'nimi' is the plural instrumental form of 'oni/ony', used to mean 'with them'.
Šel s nimi do kina.
He went with them to the cinema.
Here, 'nimi' is used as the prepositional object of 's' (with), indicating whom the discussion was held with.
Diskutoval o tom s nimi celé odpoledne.
He discussed it with them the entire afternoon.
In this example, 'nimi' serves as the object of 's', once more indicating the individuals involved in resolution of the matter.