As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):
- (svell; svall, stillum; sollinn), v. to swell (sár pat tók at s. ok þrútna); of wrath, anger (nú svall Sturlungum mjök móðr).
Possible runic inscription in Younger Futhark:ᛋᚢᛁᛚᛚᛅ
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This headword also appears in dictionaries of other languages closely related to Old Icelandic.