Central banks stepped into the market several times during the week and sold dollars, pushing the currency down.

The central bank stepped in to support the bank by giving it new lines of credit.

Meanwhile, at least a few banks are stepping back from the rush to issue new cards.

Now, however, the bank is stepping out of the shadows a bit.

European central banks stepped in to stem its rise.

Traders were buying gingerly, because "it looks like the central banks will probably step in if the dollar starts going up again," he said.

Eventually four European banks stepped forward to make the loans, reportedly under pressure from their governments.

Others said that the central banks had finally stepped in to put a cap on the dollar.

Several central banks stepped in during European and domestic trading hours to sell dollars.

But some traders said central banks might step in at that point to stem the rise.