Shadow (noun)

1. A dark area or shape produced by a body coming between rays of light and a surface.
2. A dark image projected onto a surface by a body intercepting light.
3. A patch of shade produced by a body blocking light from a source.
4. A hint or indication of something.
5. A person or thing that closely resembles or follows another.

Origin:

The word 'shadow' comes from the old english word 'sceadu' which means 'shade, darkness, or shelter.'.

Examples:

1. The shadow of the tree fell on the ground.
2. She saw her shadow on the wall.
3. The shadow of the moon covered the earth.
4. His death cast a shadow over the entire town.
5. The shadow of the past still haunts her.