Where does “būk” come from?

būk (Old Dutch) comes from Proto-Germanic būkaz, from Proto-Indo-European bʰōw- — to inflate, swell; to swell, grow, thrive, be,...

Ancestry of “būk”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	būkaz	belly, abdomen; body
2	Proto-Indo-European	bʰōw-	to inflate, swell; to swell, grow, thrive, be,...

būk — Etymology, Origin & Word History | Etymology Explorer