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intr.v. thrived or throve (thrōv), thrived or thriv·en (thrĭv′ən), thriv·ing, thrives
1. To grow vigorously; flourish: Some plants thrive in sandy soil.
2. To be successful or make steady progress; prosper: The town has been thriving on tourism.

[Middle English thriven, from Old Norse thrīfask, reflexive of thrīfa, to seize.]

thriv′er n.