For-dilgian

According to the Old English Dictionary:

-diligian;

for-dilgian

p. ode, ade; pp. od, ad To blot out, destroy; dēlēre, obnūbĭlāre, oblītĕrāre :-- He wolde ealle his þeóde fram ðam gingrum óþ ða yldran fordón and fordilgian he would do for and blot out all his nation from the younger to the elder, Bd. 3, 24; S. 556, 13: 5, 21; S. 643, 26. He ðá óðer werod ðære [MS. ðara] mánfullan þeóde fornam and fordilgade sic cētĕras nefandæ mīlĭtiæ cōpias delēvit, 2, 2; S. 504, 7: 5, 13; S. 633, 34. Ðæt hí óþ forwyrd ǽghwǽr fordiligade ne wǽron ne usque ad internĕciōnem usquequaque delērentur, Bd. 1, 16; S. 484, 17. [Orm. foirdillȝenn: Dut. ver-delgen: Ger. ver-tilgen to extirpate, destroy.] for-dilgian