On-égan

According to the Old English Dictionary:

on-égan

p. de To fear:--Sǽton him at wíne, wealle belocene, ne onégdon ná orlegra níð, Cd. Th. 259, 25; Dan. 697. Ic mé onégan (onagen, MS.) mæg, ðæt mé wráðra sum wǽpnes ecge feore beneóte, 109, 28; Gen. 1829. Ni anoegun (anoegu ná?) ic mé aerigfaerae egsan brógum, Txts. 151, 13. Cf. óga. on-egan