currency intervention; currency manipulation
Refers to official actions by a central bank or government to influence the value of its currency in foreign exchange markets. Often used in economic and political contexts.
The government resorted to currency intervention to curb the rapid appreciation of the yen.
Currency manipulation can invite international criticism.
為替介入 is a more neutral term for official currency intervention, while 為替操作 often carries a negative connotation of manipulation.
Compound of 為替 (かわせ, 'exchange' or 'money order') and 操作 (そうさ, 'operation' or 'manipulation').