SHADOW
Definition of SHADOW
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A dark image projected onto a surface where light (or other radiation) is blocked by the shade of an object.
"My shadow lengthened as the sun began to set."
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Relative darkness, especially as caused by the interruption of light; gloom, obscurity.
"I immediately jumped into shadow as I saw them approach."
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A area protected by an obstacle (likened to an object blocking out sunlight).
"The mountains block the passage of rain-producing weather systems and cast a "shadow" of dryness behind them."
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To shade, cloud or darken.
"The artist chose to shadow this corner of the painting."
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To block light or radio transmission from.
"Looks like that cloud's going to shadow us."
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To secretly or discreetly track or follow another, to keep under surveillance.
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Unofficial, informal, unauthorized, but acting as though it were.
"The human resources department has a shadow information technology group without headquarters knowledge."
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Having power or influence, but not widely known or recognized.
"The director has been giving shadow leadership to the other group's project to ensure its success."
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Acting in a leadership role before being formally recognized.
"The insurgents’ shadow government is being crippled by the federal military strikes."
Source: Wiktionary