Wiktionary
vb. To escape from being discovered or caught.
Usage examples of "run for it".
Nothing for him to do, when he was cornered on the borders, but run for it into Gwynedd.
He considered cutting the rope that tied the pony to his grey and making a run for it, but he hated leaving his armour behind almost as much as he hated fleeing from an Arimondan.
Later awn there are going to be elections, and if you wawnt another office than the one I give you, you can run for it.
The boy stopped in front of the closet, and Nancy gripped the strap of her beach bag, figuring she could swing it at his face and make a run for it if she had to.
Came back when things appeared to be tolerable, found that they weren't-and that's when the Howards had to run for it.
He took it home, again nursed it back to health, built a chickenwire run for it, and never again tried to turn it loose.
He took it home, again nursed it back to health, built a chicken-wire run for it, and never again tried to turn it loose.