To put new paint on something to make it look nicer or to protect it.
We will have to repaint the fence to make it look fresh.
フェンスを新鮮に見せるために再塗装する必要があります。
To change the color of something by painting it with a different color.
They decided to repaint the walls with a more vibrant color.
彼らは壁をより鮮やかな色で再塗装することを決めた。