Sin-

According to the Old English Dictionary:

(sine-, seonu-, v.

sin-

cpds.). The form does not occur as an independent word ; as a prefix it has usually the force ever, everlasting ; but in some cases it seems to denote magnitude, e. g. sin-here ; cf. O. H. Ger. sin-vluot the deluge. [O. Sax. O. Frs. O. H. Ger. sin- : Icel. sí- (but in the phrase sí ok æ the independent word is found) : cf. Goth. sinteins continual, daily.] -sin,sin-,sin