A dark area made when something blocks light. Also, to follow someone closely so that they cannot see you.
Shadows can be scary or mysterious. To shadow someone can be sneaky or secretive.
Examples:
The tree made a shadow on the ground.
I will shadow you as you walk through the forest.
The shadow of the building is very big.
I think my shadow is following me!
In the dark, the shadows look like monsters.
She likes to shadow her big sister everywhere.