"land bordering a large body of water," c.1300, from an Old English word or from Middle Low German schor "shore, coast, headland," or Middle Dutch scorre "land washed by the sea," all probably from Proto-Germanic *skur-o- "cut," from PIE *(s)ker- (1) "to cut" (see shear (v.)).
According to etymologists originally with a sense of "division" between land and water. But if the word began on the North Sea coast of the continent, it might as well have meant originally "land 'cut off' from the mainland by tidal marshes" (cf. Old Norse skerg "an isolated rock in the sea," related to sker "to cut, shear"). Old English words for "coast, shore" were strand (n.),