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The dollar fell further on Monday on views a Federal Reserve interest rate hike will come later rather than sooner, and the decline helped boost oil prices.
US stocks gave up gains and closed slightly lower.
US energy shares initially were among the biggest gainers on Wall Street as crude prices rebounded on the weak dollar. The euro rose more than 1% and the dollar index, a gauge of the greenback against six major currencies, lost almost as much.
Gold rose for a fourth day to a two-week high, while London copper prices hit their highest since Jan. 9. A weaker dollar boosts the purchasing power of commodity buyers paying with other currencies.
Traders and investors are focused on when the Fed will tighten policy, viewed as most likely in September or October.
The dollar added to its steepest weekly drop in 3-1/2 years after a Fed statement last week suggested a less-aggressive timetable for hiking interest rates, leading the greenback to suffer its worst week against the euro since late 2011.
"There's a very large long-dollar position in the market, and what we appear to be facing is an unwind of that position," said Richard Cochinos, head of Americas G10 FX strategy at Citi in New York.
A Fed rate hike is "widely expected" this year, though the path for subsequent policy moves will be on a meeting-by-meeting basis, Fed Vice Chair Stanley Fischer said on Monday.
MSCI's all-country world index, a measure of equity performance in 46 countries, rose 0.23%. But Wall Street retreated after spending most of the session higher.
The Dow Jones industrial average closed down 11.61 points, or 0.06%, to 18,116.04. The S&P 500 fell 3.68 points, or 0.17%, to 2,104.42 and the Nasdaq Composite lost 15.44 points, or 0.31%, to 5,010.97.
"This market is somewhere between trying to decide the interest rate, oil, dollar question while we await earnings. There's no real earnings out to give it any footing. It's just been drifting back and forth," said Rick Meckler, president of LibertyView Capital Management LLC in Jersey City, New Jersey.
European shares slid from multi-year highs as a new bout of worries concerning Greece's debt negotiations led investors to book profits on the equity market's solid start to 2015.
The pan-European FTSEurofirst 300 index of top regional shares closed down 0.66% at 1,600.24. All major country indexes in Europe fell, with Germany's DAX sliding 1.2%. The DAX hit a record high last week and is still up 21% so far this year.
US Treasuries prices rose amid Greek-inspired investor anxiety and talks about the terms of a 240-billion-euro bailout for the cash-strapped country.
Benchmark 10-year Treasuries notes > were up 5/32 in price to yield 1.9112%.
The euro strengthened against the dollar despite comments by European Central Bank President Mario Draghi on the bank's bond-buying stimulus plan, which tends to weaken the single currency.
The euro was last up 1.19% against the dollar at $1.0949 >, not far from a nearly two-week high of $1.10625 hit last week. The dollar was last down 0.23% against the Japanese yen at 119.75 yen >.
The dollar index fell 1.0% to 96.93.
Oil rose to almost $56 a barrel as a weaker dollar offset concerns over the global oversupply after Saudi Arabia indicated it was pumping near a record high of 10 million barrels per day.
Brent crude oil futures
