Judy from Tallahassee, Florida, asks why spendthrift means someone who spends money freely, when thrift now suggests careful saving. The older sense of thrift was acquired wealth or prosperity, something that comes from thriving, so a spendthrift...
spave
v.— «People will risk their lives to spave—spend to save—at Ikea.» —“Fraught & social—Diary” by Kate Muir Times (London, England) Dec. 1, 2001. (source: Double-Tongued Dictionary)