As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):
munu Old Icelandic word can mean:
- (man or mun, munda; pret. infin. mundu), v.
- 1) as an auxiliary verb simply denoting futurity, shall, will; munu margir þess gjalda, many will smart for it; ok mun hann hér koma brátt, and he will be here speedily;
- 2) denoting what is probable or pretty certain, is sure to, must; þú munt vera feigr maðr, thou are surely a death-doomed man; nú mun faðir minn dauðr vera, now my father must be dead;
- 3) in past tenses, would (eigi mundak trúa); must, kvað hann þá nú mundu dauða, he said that now they must be dead.
Possible runic inscription in Younger Futhark:ᛘᚢᚾᚢ
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This headword also appears in dictionaries of other languages closely related to Old Icelandic.