Where does “rozgrzać” come from?

rozgrzać (Polish) comes from Polish grzać, from Proto-Slavic grěti, from Proto-Indo-European gʷʰer-, from Proto-Indo-European gʷʰe-gʷʰór-e ~ gʷʰe-gʷʰr-ḗr.

Ancestry of “rozgrzać”, step by step

Step	Language	Word	Meaning
1	Polish	grzać	to heat; to warm
2	Proto-Slavic	grěti	to warm, to heat; to shine
3	Proto-Indo-European	gʷʰer-	warm, hot
4	Proto-Indo-European	gʷʰe-gʷʰór-e ~ gʷʰe-gʷʰr-ḗr	—

Every word from Proto-Indo-European gʷʰe-gʷʰór-e ~ gʷʰe-gʷʰr-ḗr →

rozgrzać — Etymology, Origin & Word History | Etymology Explorer