Gymmian

According to the Old English Dictionary:

gymmian

Substitute: gymian, gymm[i]an to cut, pierce the flesh :-- Gesyrewede [heápas] hí sylfe tó gymmienne armatas catervas (jam jamque strictis mucronibus allernatim) se jugulaturas (i. perfossuras), An. Ox. 3799. v. ge-gymian. gymmian