Eácian

According to the Old English Dictionary:

eácian

p. ode To increase (intrans.) :-- Hé him eác gesægð hú ðǽm monnum ðe him mægen and cræft wiexð, hú him eác hwílum eákiað æfter ðǽm mægenum ðá costunga crescente virtule plerumque bella tentationis augentur, Past. 163, 8. Ðonne hié geseóð ðára óðerra gesǽlða eáciende dum augmenta alienae prosperitatis aspiciunt, 231, 19. [Cf. O. H. Ger. auhón augere: Icel. auka; p. aði.] eacian