Board up Definition 1 of 2Pro Tip 1/3Protective Measure Used when taking action to safeguard a property against natural disasters or riots. We had to board up the storefront after the storm warnings. Pro Tip 2/3Temporary Fix Implies a temporary solution until professional repairs can be made. The broken window remained boarded up for a week. Pro Tip 3/3Visual Imagery Conveys a strong visual image of preparing for something serious or severe. They boarded up the cabin as the wildfire approached.