Where does “pas” come from?

pas (Old Occitan) comes from Latin passus, from Latin patior, from Proto-Indo-European peh₁- — to hate, hurt.

Ancestry of “pas”, step by step

Step	Language	Word	Meaning
1	Latin	passus	spread out; dried; step
2	Latin	patior	I suffer, endure; I allow, acquiesce, permit,...
3	Proto-Indo-European	peh₁-	to hate, hurt

pas — Etymology, Origin & Word History | Etymology Explorer