Real Dictionary

shadow
A British Member of Parliament who is a member of the shadow cabinet or who is a shadow cabinet minister belongs to the main opposition party and takes a special interest in matters which are the responsibility of a particular government minister.
Shadow is darkness in a place caused by something preventing light from reaching it.
countable noun: A shadow is a dark shape on a surface that is made when something stands between a light and the surface.
verb: If someone shadows you, they follow you very closely wherever you go.
verb: If something shadows a thing or place, it covers it with a shadow.

shadow in American English
a definite area of shade cast upon a surface by a body intercepting the light rays
adjective: of or pertaining to a shadow cabinet
noun: a dark figure or image cast on the ground or some surface by a body intercepting light
transitive verb: to overspread with shadow; shade

shadow in British English
to cast a shadow over
noun: a dark image or shape cast on a surface by the interception of light rays by an opaque body