A shadow is a dark shape on a surface that is made when something stands between a light and the surface.

Shadow is darkness in a place caused by something preventing light from reaching it.

If something shadows a thing or place, it covers it with a shadow.

If someone shadows you, they follow you very closely wherever you go.

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.

If you say that something is true without a shadow of a doubt or without a shadow of doubt, you are emphasizing that there is no doubt at all that it is true.

If you live in the shadow of someone or in their shadow, their achievements and abilities are so great that you are not noticed or valued.

If you say that someone is a shadow of their former self, you mean that they are much less strong or capable than they used to be.