Are there any good ways to profit in USD terms if BTC/USD goes down?
Technically, buying dollars with them is shorting bitcoin. But you are probably looking for leverage to do a trade.
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http://en.bitcoin.it/wiki/Trade#FinancialIf I am long USD and flat BTC with BTC/USD at $47 and then BTC/USD drops from $47 to $46 I can buy more BTC at $46 so I would have profited in BTC terms but in USD terms, I still have the same number of USD. So in USD terms, I didn't profit any from the move from $47 to $46. I'm looking for ways to profit in USD terms, not BTC terms, if the BTC/USD exchange rate goes lower.
If you buy same number of BTC at 46, then you will have some USD left over. That is your profit in USD terms.