Fágettan

According to the Old English Dictionary:

fágetan, fággetan;

fágettan

p. te; pp. ed To turn colour, change, vary; văriāre :-- Se móna fággeteþ [fágetteþ MS. R; fágeteþ MS. P] oððe asweartaþ the moon turns colour or becomes dark, Bd. de nat. rerum; Lchdm. iii. 240, 23; Wrt. popl. science 5, 15. fagettan