Obs. [OE. wiþersaca = OFris. withirseka, OS. wiðarsako, OHG. widarsahho (MHG. widersache, MHG., G. widersacher): f. wiþer- WITHER-1 + -saca, agent-n. f. stem sak- of SAKE sb.] An adversary, enemy.
In OE., simply and in phr. Godes wiþersaca, often = apostate.
c. 960. Æthelwold, Rule St. Benet (Schroēr, 1885), lxii. 112. Ne beo he na sacerd ʓeteald ac Godes wiðersaca.
c. 1000. Ags. Gosp., Matt. xxvi. 14. Iudas se wiþersaca.
c. 1205. Lay., 1808. Geomagog þat was þe heihste Godes wiðer-saka. Ibid., 12620. Þat is goddes wiðer-sake.