To shade, cloud or darken.
The artist chose to shadow this corner of the painting.
To block light or radio transmission from.
Looks like that cloud's going to shadow us.
To secretly or discreetly track or follow another, to keep under surveillance.
To represent faintly and imperfectly.
To hide; to conceal.
To accompany (a professional) during the working day, so as to learn about an occupation one intends to take up.
To make (an identifier, usually a variable) inaccessible by declaring another of the same name within the scope of the first.
To apply the shadowing process to (the contents of ROM).