Where does “ইস্ত্ৰি” come from?

ইস্ত্ৰি (Assamese) comes from Bengali ইস্ত্রি, from Portuguese estirar.

ইস্ত্ৰি (Assamese): press, iron

Definitions

Step	Language	Word	Meaning
1	Bengali	ইস্ত্রি	—
2	Portuguese	estirar	—

ইস্ত্ৰি — Etymology, Origin & Word History | Etymology Explorer