What is the origin of spendthrift?
Spendthrift “a person who spends wastefully” is a compound of the verb spend and the noun thrift. Spend has been in the English language for well over 1000 years, but it is in fact of Latin origin; while most English words derived from Latin entered following the Norman conquest of England in 1066, there are a select few that spread from Latin long beforehand and took root in West Germanic languages such as English and German. In this case, spend derives from Latin expendere “to weigh out, lay out, pay,” a compound of the prefix ex- “out of, from” and the verb pendere “to hang.” Thrift, in contrast, derives from Old Norse, in which the word means “well-being” or “prosperity,” and is related to the verb thrive. This “prosperity” sense is obsolete, of course; thrift shifted in definition during the 16th century to mean “savings,” and from there, it adopted its current meaning of “economy” and “spending little money.” Spendthrift was first recorded in English at the turn of the 17th century.