foreshadow (v.)

Middle English schadowen, schadwen, Kentish ssedwi, "provide, cover, or overspread with shade, protect from the sun or other light" (mid-14c.), from late Old English sceadwian "to protect as with covering wings" (also see overshadow), from the root of shadow (n.). Similar formation in Old Saxon skadoian, Dutch schaduwen, Old High German scatewen, German (über)schatten.

From late 14c. as "cast a shadow over" (literal and figurative), from early 15c. as "mark (in illustration, etc.) with slight gradations of color or light." The meaning "to follow like a shadow" is attested once c. 1600 and not again until 1872. Related: Shadowed; shadowing.