Where does “ürügy” come from?

ürügy (Hungarian) comes from Hungarian űr, from Hungarian üreg, from Hungarian ür-.

Ancestry of “ürügy”, step by step

Step	Language	Word	Meaning
1	Hungarian	űr	void, gap; space, outer space; emptiness
2	Hungarian	üreg	cavity, hole, cave, pit, cavern, sinus
3	Hungarian	ür-	—