The euro nursed losses on Thursday, having pulled back from a three-year high.
The dollar held its modest losses on Wednesday, even as the Federal Reserve's latest Beige Book showed U.S. business activity was expanding.
The euro retreated as investors sold the currency on doubts that the ECB would back away from its pledge to keep buying bonds.
The dollar wallowed at three-year lows against a basket of currencies on Monday, while the euro stood tall.
The dollar slumped to a more than three-year low against the euro on Friday.
The dollar recouped some of its recent losses, following its biggest one-day fall in a month.
The U.S. dollar slumped on Wednesday after a report that China was ready to slow or halt its U.S. treasury purchases.
The dollar climbed on Tuesday, recovering further from last week's decline to the lowest in more than three months.
The dollar hit a more than one-week high against a basket of other major currencies on Monday.
The dollar rose Friday as investors reckoned a modest payrolls report would not deter the Fed from raising interest rates.
The dollar dipped on Thursday, unable to hold onto gains made the previous day on the back of upbeat U.S. data.
The dollar rallied on Wednesday on upbeat U.S. manufacturing and construction data.
The dollar sank on Tuesday to its lowest in more than three months, weighed down on the first trading day of 2018.
The dollar slipped to its lowest in more than three months against a basket of major currencies on Friday.
The dollar fell to a four-week low on a less certain U.S. economic outlook after the passage of major tax cuts.
The U.S. dollar fell to a 3-1/2 week low as traders bet central banks would begin reducing monetary stimulus in 2018.
The dollar was little changed Tuesday as traders brushed off encouraging Japanese inflation data.
Catalan separatists won a regional election, stoking concerns about the possible break-up of the euro zone's fourth-largest economy.
The dollar edged higher after two days of losses in light trading, lifted by generally positive U.S. data
The dollar, seen as having limited potential since investors already factored in the tax bill, slid against most major currencies Wednesday.