As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):
- m., in the phrase, fyrir önnkost, intentionally, purposely; sigla skipi á sker fyrir önnkost, to run a ship ashore purposely.
Possible runic inscription in Younger Futhark:ᚢᚾᚾᚴᚢᛋᛏᚱ
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This headword also appears in dictionaries of other languages closely related to Old Icelandic.