false start

noun

1. The act of an athlete starting a race before being signaled to do so.
2. The act of an offensive player moving across the line of scrimmage prior to the snap.
3. An attempt at something that does not work, requiring one to start over.

   “After a "false start" that was too vigorous, overloading the motors, No. D171 made a very successful unassisted run from Tyne Dock to Consett.”

   “He spent nearly 20 years developing the movie, keeping at it through false starts and heartbreaking dead ends. And when he got the chance to make it, he went all in, devising entire societies full of baroquely souped-up death machines and screaming war-cults.”