To attract.
The campfire drew in numerous unwary moths.
To get (someone) involved.
They drew in the quiet boy who hadn't wanted to participate.
(of night/darkness/winter) To approach.
They saw that the night was quickly drawing in, so they pitched their tent.
(of nights or evenings) To become dark earlier as a result of seasonal change.
It's that time of year again when the evenings really start to draw in.
To reduce or contract; to become shorter.