Jerry Jones opening door for Tony Romo QB switch?

Jerry Jones has been asked the question endlessly -- in a thousand different ways.

What would it take for the Cowboys to sit rookie quarterback Dak Prescott in favor of veteran Tony Romo?

"I don't have a definition for it, but you'll know it when you see it," the Cowboys owner and general manager told KRLD-FM on Tuesday, per The Dallas Morning News. "It's kind of like the definition I heard one time of another issue, trying to define a negative topic, and they said: 'I don't know how to say it, but it's just something that when you see it, you know it's there.' We'll see it."

Jones is simply searching for new ways to answer the question. He defiantly shot down the idea that Prescott's rough…