Hjaðna

As defined by the Cleasby & Vigfusson Old Norse to English dictionary:

hjaðna

að, to sink, dwindle, of froth and the like.

Possible runic inscription in Younger Futhark:ᚼᛁᛅᚦᚾᛅ
Younger Futhark runes were used from 8th to 12th centuries in Scandinavia and their overseas settlements