Jakob Jakobsen, An Etymological Dictionary of the Norn Language in Shetland…
“ Tabu-word, used at sea by boat fishermen, “de name o’ muttel is said to geng to f.”, the knife has fallen overboard and gone to the bottom (tabu-phrase at sea when fishing) . Levenwick, Du. — Appears to be a deriv. of the adj. fast, and prop. to denote firm ground (cf. hardi, sb., and wolhard, sb.) , but may also be explained from O.N. vǫst (vözt: Fr.) , f., fishing-ground; fishing-bank, as initial v sometimes changes to f in Shetl. Norn. “vǫst” is still found in a somewhat diff. ”
