Nobody trusted Mark after he was revealed to be a double-dealer in the negotiations.

The undercover officer posed as a buyer to catch the drug-dealer.

The committee discovered that the seemingly loyal advisor was a double dealer who had been leaking documents to both sides.

At the town hall, a Green New Dealer argued that investing in clean energy would create jobs and reduce emissions.

I visited several dealerships to compare prices before buying a new car.

She stopped by the dealership to test drive the new compact hatchback and ask about warranty options.