1. Root

 bʰelǵʰ

2. Lexical meanings

 DE: schwellen
EN: swell

3. Comparative evidence

4. Formally comparable roots

 1.bʰel, 1.bʰleh₁, 1.bʰleu̯, 1.bʰleu̯h₁, 1.bʰleu̯h₂, 1.bʰleu̯h₃, 2.bʰel, 2.bʰleh₁, 2.bʰleu̯h₁, 2.bʰleu̯h₂, 2.bʰleu̯h₃, 3.bʰel, 3.bʰleh₁, 4.bʰel, bʰlenḱ, bʰleḱ, bʰeld, bʰelk, bʰelh₁, bʰelh₂, bʰelh₃, bʰelk, bʰelu̯, bʰled, bʰleh₂, bʰleh₂d, bʰleh₂g, bʰleh₃, bʰlei̯, bʰlei̯d, bʰlei̯g, bʰlei̯ǵ, bʰlendʰ, bʰleu̯dh₂, bʰleu̯k, bʰleg, bʰleǵ

5. Formally/Semantically comparable roots

 1.bʰleu̯, 1.bʰleu̯h₁, 1.bʰleu̯h₂, 1.bʰleu̯h₃, 3.bʰel, bʰlei̯

6. Revised root variants

7. Comments

 Watkins 2011: 10: extended form of *3.bhel- ‘blow, swell’.

8. References

LIV = Rix, Helmut et al. 2001. Lexikon der indogermanischen Verben: Die Wurzeln und ihre Primärstammbildungen. 2 Aufl. Wiesbaden: Dr. Ludwig Reichert Verlag.

Watkins 2011 = Watkins, Calvert. 2011. The American heritage dictionary of Indo-European roots. 3rd revised ed. Boston, New York: Houghton Mifflin Harcourt.