Emily Dickinson Lexicon

FRO, adv. [Sax. fra; Scot. fra, frae; Dan. fra. It denotes departure and distance, like from, of which it may be a contraction. In some languages it is a prefix, having the force of a negative. Thus in Danish, frabringer, to bring from, is to avert, to dispel; frakalder, to recall. In Goth. bugyan is to buy; frabugyan is to sell, that is, in literal English, frombuy.]

From; away; back or backward; as in the phrase, to and fro, that is, to and from, forward or toward and backward, hither and thither.