BT Šab 103a(2) :בשלמא לרב מיחאזי כמאן דחר חורתא לבני^י^נא‏ : granted for Rav it appears that he drilled a hole in the building
See the entire entry for ḥwrh#2 n.f. hole

BT Šab 103a(2) :מיחאזי כמאן דחר חורתא‏ : it appears as if he drilled a hole in the building
See the entire entry for ḥrr#4 vb. to bore a hole