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To cover parts of a building (often the windows) with wooden planks. That hurricane is bearing down on us, so we need to leave town as soon as we finish boarding up the windows. I can't believe someone finally bought that old, abandoned house—it's been boarded up for years.
Covered with wooden planks (especially over the windows), as of an abandoned building. I can't believe someone finally bought that old, boarded up house—it's been empty for years.
board something up
to enclose or seal a building or part of a building with boards or panels. We will have to board this house up if we can't sell it. Should I board up the house while I am away that season?
1. To fill or block an opening with boards: The carpenter boarded up the hole in the wall to keep the cold air from coming in. Before the storm, we boarded the windows up.
2. To enclose or seal a building or part of a building with boards: The landlord boarded up the old building to keep trespassers away. Two weeks after the owners closed the motel, they boarded it up.