a rod for (one's) (own) back(redirected from rod for their own back)
a rod for (one's) (own) back
Future problems caused by something ill-advised that one is doing in the present. Primarily heard in UK. I'm telling you, if you don't get some more exercise now, you'll be making a rod for own back when you get older. These reckless investments a going to turn into a rod for their backs down the line.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.