Where does “espraintes” come from?

espraintes (Old French) comes from French épreintes, from French espreinte — a desire to go to stool.

Ancestry of “espraintes”, step by step

Step	Language	Word	Meaning
1	French	épreintes	—
2	French	espreinte	a desire to go to stool

espraintes — Etymology, Origin & Word History | Etymology Explorer