The Proto-Indo-European word *bʰelĝh-
Word *bʰelĝh-
Meaning swell
See also Proto-Indo-European: *bʰel- ‘to blow, to blow up, to swell’
Synonyms *bhel-3, bhlē-, *bʰreus-, *p(h)eu-

Comments
Mallory J.P. and Adams D. (2006)