Eflast

As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):

eflast Old Icelandic word can mean:

eflast

v. refl. to grow strong (hann fann, at mótstöðumenn hans efldust);

eflast

~ at her, to gather, raise troops;

eflast

~ til ríkis, to win a kingdom (by force of arms);

eflast

poet., ~ við e-n, to marry into one’s family, = mægjast.

Possible runic inscription in Younger Futhark:ᛁᚠᛚᛅᛋᛏ