drop in value
fall in value
go down in value
decrease in value

The currency has fallen in value by two-thirds since last July.

Since then, the floating pound has fallen in value by about 11 percent.

As stocks fall in value, short interest tends to decline.

Of course, you'll lose out if the euro falls in value.

They fell in value to about $160,000, so the fund lost $840,000.

But from the euro-denominated point of view, your house has fallen in value by another 25%.

Within a few days, Mexico's currency fell in value almost 30 percent.

These funds fell in value by four-tenths of 1 percent.

Unless they do, the won is likely to keep falling in value.

The risk is that the shares may fall in value leaving the securities house with a huge loss.