In Russian "косарь" means a thousand. But what are the different forms and cases of "косарь"? For example, can you say "Это двухкосарёвый вопрос на Stack Exchange русского языка"? What are the dative or genitive cases of "косарь"?
P.S. "Косарь" is, as far as I understand, informal. Russians would usually use it in dialogues like "Сколько у тебя с собой рублей?" -- "Пять косарей."