Where does “подыхать” come from?

подыхать (Russian) comes from Russian по́-, from Russian -бира́ть.

подыхать (Russian): to die, to croak, to kick the bucket

Definitions

Step	Language	Word	Meaning
1	Russian	по́-	—
2	Russian	-бира́ть	—

подыхать — Etymology, Origin & Word History | Etymology Explorer