What is "restain"

Usage examples of "restain".

My grandfather had restained the two deep vermilion circles into the prow.

The narrow stairs creaked, and the dark wood, although recently restained, was worn.

Dropping down onto the wooden swing, which needed sanding and restaining, he sipped his coffee and tried to harden his heart.

Every building had been recently restained in preparation for our coming and the Princess's nuptials, and thus they were almost garishly bright.