Fynegian

According to the Old English Dictionary:

fynegian

p. ode; pp. od [fynig mouldy] To become mouldy or musty; mūcescĕre :-- Ðæt ðæt hálige húsel sceole fynegian that the holy housel should become mouldy, L. Ælf. C. 36; Th. ii. 360, 7. fynegian