Where does “bestei” come from?

bestei (Proto-Balto-Slavic) comes from Proto-Indo-European bʰedʰh₂- — to dig, burrow; to pierce, stab.

Ancestry of “bestei”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	bʰedʰh₂-	to dig, burrow; to pierce, stab

bestei — Etymology, Origin & Word History | Etymology Explorer