Wiktionary
vb. (context set phrase English) To have permission or freedom to move around throughout an area or to use something at will.
Usage examples of "have the run of".
But she did have the run of the Ambassador's suite, currently turned over to her Baron's use, and by observation had memorized what you keyed in on the entry pads to achieve voice access to the centralized computer database.
If you let them have the run of the house, they'll take advantage, I'm sure of it.
Inhabitants of Krynn, reeling from the departure of the gods, are besieged by powerful dragon overlords that have the run of the land.
If in the low ceiling of the blind passage there existed a trap through which to hoist oneself into that same newly conceived space, from there anyone could climb up to the clocks and then have the run of the entire vessel.
At home I have the run of a charming and beautiful Orbital which would seem very clean and uncrowded to somebody from Earth.
My own mother let me have the run of the Keep when I was a little girl because I was taught about the dangers and how to avoid them.