From Middle English frosty, forsty, from Old English forstiġ, fyrstiġ, from Proto-West Germanic *frostag, *frustīg, equivalent to frost + -y. Cognate with West Frisian froastich, Dutch vorstig, German Low German fröstig, German frostig, Swedish frostig. Compare also Saterland Frisian froasterch, German Low German frösterg.
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