with object To overshadow; to shade, darken; to obscure. (literal and figurative).
Mid 16th century; earliest use found in Pylgrimage of Perfection. From classical Latin obumbrāt-, past participial stem of obumbrāre to overshadow, to shade, to darken, to obscure, in post-classical Latin also to prefigure, foreshadow from ob- + umbrāre. Compare earlier obumbrate, and later adumbrate, umbrate.