The euro and sterling fell against the dollar on Thursday as investors sold them before European Central Bank and Bank of England policy meetings expected to re-affirm loose monetary policy.
Those moves lifted the dollar off a six-week low against a basket of currencies hit after the Federal Reserve on Wednesday gave no fresh hints that it was preparing to scale back stimulus at its next meeting in September.
(Read more: Steady Fed: Printing presses to keep on rolling)
The euro was down 0.5 percent at $1.3240, retreating from a six-week high of $1.3345 struck after the Fed decision. Sterling fell to $1.5140, helping push the dollar index 0.7 percent higher to 82.056.
The ECB is seen likely to hold off on further stimulus but to stand by last month's forward guidance that its main interest rate will stay at 0.5 percent or lower for an "extended period".