Ge-sweorcan

According to the Old English Dictionary:

he -swyrcþ;

ge-sweorcan

p. -swearc, pl. -swurcon; pp. -sworcen To become dark, be darkened, saddened, angry :-- Ródor eal geswearc the heavens all grew dark, Elen. Kmbl. 1709; El. 856: Beo. Th. 3583; B. 1789: Cd. 166; Th. 207, 4; Exod. 461. Seó eorþe wæs gesworcen and aþýstrod under his fótum caligo sub pedibus ejus, Ps. Th. 17, 9. Ðá geswearc se Godes man semninga and ongan heardlíce and bitterlíce wépan then suddenly the man of God become sad and began to weep sorely and bitterly; solutus est in lacrymis vir Dei, Bd. 4, 25; S. 600, 29: Exon. 77 a; Th. 290, 3; Wand. 59. Geswearc ðá sweor the father-in-law then grew angry, 67 a; Th. 247, 13; Jul. 78. Cf. asweorcan. [O. Sax. gi-swerkan to become dark, literally and metaphorically as in English: O. H. Ger. ge-sworcen; part. p. turbulentus, nubilus.] ge-sweorcan