late 13c., from O.Fr. forge, earlier faverge, from L. fabrica "workshop," from faber (gen. fabri) "workman in hard materials, smith." Sense of "to counterfeit" is in Anglo-Fr. verb forger "falsify," from O.Fr. forgier, from L. fabricari "to frame, construct, build." Related: Forged; forger; forging.
1610s, "make way, move ahead," most likely an alteration of force, but perhaps from forge (n.), via notion of steady hammering at something. Originally nautical, in reference to vessels.