couldn't stop a pig in a passage

obsolete Used to describe someone who is bow-legged. I know young Joseph couldn't stop a pig in a passage right now, but doctors say that the condition may well correct itself as he grows taller. I couldn't stop a pig in a passage when I was young, but after wearing braces and doing exercises, my legs are much straighter now! As a kid, I couldn't stop a pig in a passage and had a very hard time walking as a result.