A-sánian

According to the Old English Dictionary:

a-sánian

p. ode; pp. od To languish, grow weak, diminish; langues-cere, laxari :-- Nǽfre ic lufan sibbe forlǽte asánian never will I permit the love of my kin to languish, Exon. 50a; Th. 172, 23; Gú. 1148. a-sanian