Declínian

According to the Old English Dictionary:

declínian

pp. od To decline (in grammar):--Mæg man on ǽgðrum ende hine (a compound noun) declínian, Ælfc. Gr. Z. 88, 6. Wé habbað nú declínod þá eahta frumcennedan pronomina, 100, 6. declinian