This is the 2847th most frequent Polish word.
kosza
"Kosza" in English means "of the basket" or "from the basket" (genitive singular form of "kosz").
In this sentence, 'kosza' refers to a trash bin and is used in the genitive case due to the verb 'wrzucić' (to throw) requiring its object in this case.
Wrzuć te papiery do kosza.
Throw those papers into the trash bin.
Here, 'kosza' is used in the genitive case after the preposition 'obok' (next to), which governs the genitive case.
Stoję obok kosza na śmieci.
I am standing next to the trash bin.
In this context, 'kosza' refers to a basketball hoop or basket and is in the genitive case due to the prepositional phrase 'do kosza' indicating movement towards the basket.