shadowing
 遮蔽
 Shad·ow, v. t. [imp. & p. p. Shadowed p. pr. & vb. n. Shadowing.]
 1. To cut off light from; to put in shade; to shade; to throw a shadow upon; to overspead with obscurity.
 The warlike elf much wondered at this tree,
 So fair and great, that shadowed all the ground.   --Spenser.
 2. To conceal; to hide; to screen. [R.]
 Let every soldier hew him down a bough.
 And bear't before him; thereby shall we shadow
 The numbers of our host.   --Shak.
 3. To protect; to shelter from danger; to shroud.
    Shadowing their right under your wings of war.   --Shak.
 4. To mark with gradations of light or color; to shade.
 5. To represent faintly or imperfectly; to adumbrate; hence, to represent typically.
    Augustus is shadowed in the person of Æneas.   --Dryden.
 6. To cloud; to darken; to cast a gloom over.
    The shadowed livery of the burnished sun.   --Shak.
 Why sad?
 I must not see the face O love thus shadowed.   --Beau. & Fl.
 7. To attend as closely as a shadow; to follow and watch closely, especially in a secret or unobserved manner; as, a detective shadows a criminal.
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 Shad·ow·ing, n.
 1. Shade, or gradation of light and color; shading.
 2. A faint representation; an adumbration.
    There are . . . in savage theology shadowings, quaint or majestic, of the conception of a Supreme Deity.   --Tylor.
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 shadowing
      adj : following surreptitiously; keeping under surveillance;
            "always on guard against shadowing submarines" [syn: tailing]
      n : the act of following someone secretly [syn: tailing]