A dark image projected onto a surface where light (or other radiation) is blocked by the shade of an object.

Relative darkness, especially as caused by the interruption of light; gloom; obscurity.

An area protected by an obstacle (likened to an object blocking out sunlight).

(figurative) That which looms as though a shadow.

A small degree; a shade.

An imperfect and faint representation.

(UK, law enforcement) A trainee, assigned to work with an experienced officer.

One who secretly or furtively follows another.

An inseparable companion.

(typography) A drop shadow effect applied to lettering in word processors etc.

An influence, especially a pervasive or a negative one.

A spirit; a ghost; a shade.

(Jungian psychology) An unconscious aspect of the personality.

(transitive) To shade, cloud, or darken.

(transitive) To block light or radio transmission from.

(particularly espionage) To secretly or discreetly track or follow another, to keep under surveillance.

(transitive) To represent faintly and imperfectly.

(transitive) To hide; to conceal.

(transitive) To accompany (a professional) during the working day, so as to learn about an occupation one intends to take up.

(transitive, programming) To make (an identifier, usually a variable) inaccessible by declaring another of the same name within the scope of the first.

(transitive, computing) To apply the shadowing process to (the contents of ROM).

Unofficial, informal, unauthorized, but acting as though it were.

Having power or influence, but not widely known or recognized.

(politics) Acting in a leadership role before being formally recognized.

(Australia, politics) Part of, or related to, the opposition in government.