Etymology
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thrift (n.)

c. 1300, "fact or condition of thriving," also "prosperity, savings," from Middle English thriven "to thrive" (see thrive), influenced by (or from) Old Norse þrift, variant of þrif "prosperity," from þrifask "to thrive." Sense of "habit of saving, economy" first recorded 1550s (thrifty in this sense is recorded from 1520s; also see spendthrift). Thrift shop attested by 1919.

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Definitions of thrift

thrift (n.)
any of numerous sun-loving low-growing evergreens of the genus Armeria having round heads of pink or white flowers;
thrift (n.)
extreme care in spending money; reluctance to spend money unnecessarily;
Synonyms: parsimony / parsimoniousness / penny-pinching
From wordnet.princeton.edu