Forþian

According to the Old English Dictionary:

forþian

p. ode; pp. od To further, aid, assist, advance, perform; promŏvēre :-- He ne muge hit forþian he may not perform it, Chr. 675; Erl. 38, 11: 1052; Erl. 182, 2. Ðæt he Godes circan forþige ut Dei ecclēsias promŏveat, L. I. P. 2; Wilk. 147, 34. DER. ge-forþian. forþian