M.E. thrusten, thrysten (v.); O.N. thrysta "to thrust, force."
Pišrâné, from piš "before; in front" (Mid.Pers. pêš "before, earlier," O.Pers. paišiya "before; in the presence of") + râné, from rândan "to push, drive, cause to go" (causative of raftan "to go, walk, proceed," present tense stem row-, Mid.Pers. raftan, raw-, Proto-Iranian *rab/f- "to go; to attack").