When you want to say that you refuse to enter some location, the traditional expression is not “step foot,” but “set foot”: “I refuse to set foot in my brother-in-law’s house while he lets his vicious pit bull run around inside.”
step foot
When you want to say that you refuse to enter some location, the traditional expression is not “step foot,” but “set foot”: “I refuse to set foot in my brother-in-law’s house while he lets his vicious pit bull run around inside.”