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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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.