spendthrift - Dictionary definition and meaning for word spendthrift
Spendthrift is actually a misnomer...split it as SPEND+THRIFT. Thrifty means, careful use of resources, so a spendthrift should actually mean someone who carefully spends money, but it means SOMEONE WHO WASTES MONEY.
Spend+thirst=Some1 who is thirsty for spending money
SPell the END of THRIFTiness. A Spendthrift may have been thrifty once, but now he isn't.
ORIGIN : SPENDTHRIFT = SPEND + THRIFT(SAVINGS) SO it means who spend the savings.