
der Rubel
ruble
The official unit of currency in Russia and Belarus.
Für die Reise nach Moskau musste er Euro in Rubel umtauschen.
For the trip to Moscow, he had to exchange euros for rubles.
ruble
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ruble
The official unit of currency in Russia and Belarus.
Für die Reise nach Moskau musste er Euro in Rubel umtauschen.
For the trip to Moscow, he had to exchange euros for rubles.

money is rolling in
A colloquial expression meaning that a lot of money is being taken in or that business is going well.
Seitdem sie ihren Onlineshop eröffnet hat, rollt bei ihr der Rubel.
Ever since she opened her online shop, the money has been rolling in for her.
Pay attention to the verb. If the verb is 'rollen' (to roll), it is the idiom 'der Rubel rollt' (business is going well / the money is rolling in). With other verbs such as 'kosten' (to cost) or 'umtauschen' (to exchange), it refers to the currency.
Im Weihnachtsgeschäft rollt bei den Händlern der Rubel.
During the Christmas shopping season, the money is rolling in for retailers.
The expression 'der Rubel rollt' (the money is rolling in) is a fixed idiom. It means that someone is earning a lot of money or that a business is very profitable. The form does not change.
Seit der Eröffnung seines Restaurants rollt bei ihm der Rubel.
Since the opening of his restaurant, the money has been rolling in for him.
The idiom 'der Rubel rollt' (the money is rolling in) is mainly used in colloquial language. You would be unlikely to find it in a formal business report.
Wow, neues Auto? Bei dir scheint der Rubel ja zu rollen!
Wow, new car? Looks like the money is really rolling in for you!
When 'Rubel' (ruble) is used as a currency, it often appears with a number and without an article, or with prepositions such as 'in.' The plural is also 'Rubel' in German.
Er hat 100 Euro in russische Rubel gewechselt.
He exchanged 100 euros for Russian rubles.
euro
Euro literally refers here to the currency taken in. In the fixed colloquial expression „der Rubel rollt“ (money is rolling in), Rubel generally means that a lot of money is coming in or that business is doing well. For this figurative statement, Euro cannot simply be used instead of Rubel.

Im Sommer rollte in dem Geschäft der Rubel.
During the summer, money was rolling in at the business.
Das Geschäft nahm im Sommer viele Euro ein.
The business took in a lot of euros during the summer.