Forfend comes from Middle English forfenden, combining the intensive prefix for- with fend (an aphetic form of defend, from Old French defendre, from Latin defendere 'to ward off'). It means to avert or forbid, now chiefly archaic ('heaven forfend'). The development is chiefly a borrowing or learned continuation, carrying an older form and meaning into English rather than building the word from a purely native base. In present use, it is used as a verb meaning "to ward off or avert; to forbid", so the historical material remains connected with the current sense rather than standing as bare ancestry. The wider English family includes related forms such as fend, defend, and fence, showing how the same historical material continues to organize neighboring vocabulary. The named historical forms include Old English for- and Latin defendere, keeping the history tied to concrete forms rather than a loose resemblance.