set foot in (some place)
To enter some location. It wasn't me—I've never set foot in that building before! If you ever set foot in my house again, I'll have you arrested.
set foot in
some place to enter into some place; to begin to enter some place. The judge ordered him never to set foot in her house again. I would never set foot in a place like that.
set foot
1. set foot in. Enter, as in I'll never set foot in this house again.
2. set foot on. Step on, as in We were so happy to set foot on dry land. [c. 1600]
set ˈfoot in/on something
enter or visit a place: Neil Armstrong was the first man to set foot on the moon, in July 1969.She’s been complaining from the moment she set foot in this hotel.