What does it mean to Winterize? winterize verb win·​ter·​ize | \ˈwin-tə-ˌrīz  \ winterized; winterizing Definition of winterize transitive verb : to make ready for winter or winter use and especially resistant or proof against winter weather     Most homeowners take the precautions to winterize their home or automobile, though they do not think about winterizing their appliances at an unoccupied second or…