U.S. economic data has remained strong, and the dollar has tended to act as a safe-haven trade, gaining as tensions between Washington and Beijing escalate.
As risk appetite picked up on Thursday, the greenback slid 0.8 percent against its currency basket to 93.862, its lowest since July 9.
"Fears of a full-blown emerging market currency crisis are basically over and we're also seeing some in the market speculating that the end of the Fed's interest hike cycle may be coming into sight," said Commerzbank currencies strategist Ulrich Leuchtmann.
The Federal Reserve is next week expected to raise benchmark borrowing costs and shed more light on its future rate path.
"Scepticism about the dollar's rally has been building so I think, seeing a small dip, traders jumped at an opportunity to unwind long bets," he said.
Emerging market currencies strengthened, led by the Indian rupee after China said it would not retaliate with competitive devaluations.
For some market participants, the dollar retains underlying strength.
"It is the champion reserve currency and it has the risk-free Fed funds rate. So the currency with the lowest risk is offering the highest yield in G10," said Andreas Koenig, global head of FX at asset manager Amundi.
NORWEGIAN CROWN SLUMPS
Closer to home, European markets were watching events at an EU summit where UK Prime Minister Theresa May appealed to her counterparts on Wednesday to drop demands for a Brexit deal that she said could rip Britain apart.
Sterling has strengthened recently on optimism that Britain and the European Union can make significant progress towards a Brexit deal at the summit.
On Thursday it rallied more than 1 percent and approached $1.33, its highest since July 10, lifted by hopes of a Brexit deal and strong UK retail data.
The Norwegian crown meanwhile slumped more than 1 percent versus the euro after the country's central bank raised interest rates for the first time in seven years, as expected, but trimmed its rate forecasts.
The crown fell to 9.6150 and dropped half a percent versus the dollar to 8.1970.
The safe-haven franc was little changed after the Swiss central bank kept its ultra-loose monetary policy in place on Thursday, citing a "fragile" exchange rate and rising international trade tensions and protectionism.
The SNB has sought to stem investor appetite for the franc over the last three and-a-half years.
The euro rose 0.9 percent against the weaker dollar at $1.1777.
The Australian dollar, a proxy for China-related trades as well as a barometer of broader risk sentiment, held at three-week highs, having gained 1.5 percent so far this week. It stood at $0.7288.
(Reporting by Tom Finn editing by Keith Weir and John Stonestreet) ((email@example.com; +44 2075427508 ; Reuters Messaging: firstname.lastname@example.org))