As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):
- adv. firmly, fast (sitja, standa binda, halda ~); sofa f., to sleep fast; drekka f., to drink hard; leita f. eptir, to urge, press hard; ryðjast um f., to make a hard onslaught; leggja f. at, to close with one (in a sea-fight); telja f. á e-n, to give one a severe lesson.
Possible runic inscription in Younger Futhark:ᚠᛅᛋᛏ
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This headword also appears in dictionaries of other languages closely related to Old Icelandic.