Thrift means being very careful about how much money you spend. Reusing the same tea bag ten times so as not to waste money is a kind of thrift.
The word thrift originally referred to fortune and has come to mean the act of being economical; a thrifty person, or someone who practices thrift, is likely to be fortunate in the sense that he has savings. At a thrift store, you will find inexpensive clothing. You probably don’t want to exercise thrift when deciding on something important, like which brain surgeon to use. You may also find thrift on sunlit mountaintops, in the form of a slender-leaved plant with pink flowers.