Reconstruction:Proto-Slavic/valъ

Etymology
Probably convergence of two or more cognate terms, at least some of which reflect (o-stem) ~  (u-stem), ultimately from. Cognate with 🇨🇬, dial. 🇨🇬,.

Some descendants have added/innovated (possibly in post proto-Slavic period) the meaning “barrage, wall” under the influence of akin 🇨🇬, 🇨🇬.

Noun

 * 1) roll, slump, downturn
 * 2)  wave, billow
 * 3)  roller, cylinder tool/shape
 * 4)  barrage, heap, dyke, embankment
 * 1)  barrage, heap, dyke, embankment
 * 1)  barrage, heap, dyke, embankment

Declension
Both o- and u-stem paradigms are attested, without clarity which meaning comes from which declension type:

Descendants
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 * East Slavic:
 * South Slavic:
 * West Slavic:
 * South Slavic:
 * West Slavic:
 * West Slavic:
 * West Slavic:
 * West Slavic:
 * West Slavic:
 * West Slavic:
 * West Slavic:
 * West Slavic:
 * West Slavic:
 * Non-Slavic: