What is a 'desire path'? That was the question on Randling tonight. And I knew the answer!
As The Bette Davis Cup Squad correctly answered, it's a shortcut, an unofficial path worn through parkland, made by people refusing to use the official path.
I wouldn't have known the word except that someone put up a sign saying, 'We want our desire path', when our favorite exit from Quarries Park was blocked off.