Did you mean shadow?
shadow
noun
°A dark image projected onto a surface where light is blocked by the shade of an object.
"My shadow lengthened as the sun began to set."
°Relative darkness, especially as caused by the interruption of light; gloom, obscurity.
"I immediately jumped into shadow as I saw them approach."
verb
°To block light or radio transmission.
"Looks like that cloud's going to shadow us."
°To secretly or discreetly track or follow another, to keep under surveillance.