currency manipulation → χειραγώγηση νομίσματος
currency manipulator → χειραγωγός νομίσματος
"Currency manipulator" is a term used to indicate countries that manipulate the rate of exchange for purposes of preventing effective balance of payments adjustment or gaining unfair competitive advantage in international trade. It is also applied to countries that intervene in their own foreign exchange markets.
Currency manipulation or currency intervention is a monetary policy operation which occurs when a government or central bank buys or sells foreign currency in exchange for their own domestic currency, generally with the intention of influencing the exchange rate and trade policy. Policymakers may have different reasons for currency manipulation, such as controlling inflation, maintaining international competitiveness, financial stability, etc.
https://en.wikipedia.org/wiki/Currency_manipulator