vt. 遮阴, 使阴暗, 使失色, 使相形见绌, 使蒙上阴影

Overshadow \O`ver*shad"ow\, v. t. [imp. & p. p. {Overshadowed};
p. pr. & vb. n. {Overshadowing}. ] [Cf. {Overshade}. ]
1. To throw a shadow, or shade, over; to darken; to obscure.

There was a cloud that overshadowed them. --Mark ix.
7.

2. Fig.: To cover with a superior influence; to be viewed as
more important than. --Milton.
[1913 Webster +PJC]

3. To cause to be sad or disappointing; to cast a sad shadow
on; as, an accidental death overshadowed the joy of the
festival.
[PJC]