The Proto-Indo-European word *bʰel-
Word *bʰel-
Meaning to blow, to blow up, to swell
See also Proto-Indo-European: *bʰelĝh- ‘swell’
Proto-Indo-European: *bʰólĝhis- ‘(skin) bag, bolster’
Proto-Indo-European: *bʰlei- ‘to become inflated’
Synonyms *bʰleu-, *pup-, *wāt-, *h₂weh₁-, *h₂weh₁-nt-, teuh-, *h₁engʷ-, *hₐeid-, k̂euh₁-

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