Cwincan

According to the Old English Dictionary:

ic cwince, ðú cwincst, he cwincþ,

cwincan

pl. cwincaþ; p. cwanc, pl. cwuncon; pp. cwuncen To disappear, vanish, decrease; evanescere, diminuere, deficere, Leo A. Sax. Gl. 209. DER. a-cwincan. cwincan