This is the 500th most frequent Czech word.
našeho
"Našeho" means "of our" or "our" (possessive, masculine singular or neuter singular in the genitive/accusative case).
In this sentence, 'našeho' is used as the masculine singular accusative form of 'náš', referring to 'our dog'.
Viděl jsem našeho psa na zahradě.
I saw our dog in the garden.
Here, 'našem' is the masculine singular locative form of 'náš', referring to 'our project'.
Mluvili jsme o našem projektu.
We spoke about our project.
In this example, 'našeho' is the masculine singular genitive form of 'náš', referring to 'our neighbor'.