Etymology
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thrive (v.)

c. 1200, from a Scandinavian source akin to Old Norse þrifask "to thrive," originally "grasp to oneself," probably reflexive of þrifa "to clutch, grasp, grip, take hold of" (compare Norwegian triva "to seize," Swedish trifvas, Danish trives "to thrive, flourish"), of unknown origin. Related: Thrived (or throve); thriving.

updated on January 29, 2014

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Definitions of thrive from WordNet

thrive (v.)
grow vigorously;
Synonyms: boom / flourish / expand
thrive (v.)
make steady progress; be at the high point in one's career or reach a high point in historical significance or importance;
Synonyms: prosper / fly high / flourish
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.