Æf-dýne

According to the Old English Dictionary:

es;

æf-dýne

m. A descent, declivity:--Æfdýni (esdyni, UNCERTAIN MS.) defexum, decliuium (cf. deuexu[m], declibium, descensum, Corp. Gl. Hessels. 41, 140), Hpt. 33, 250, 3. æf-dyne