Meaning

verb grow vigorously

verb make steady progress; be at the high point in one's career or reach a high point in historical significance or importance

originFrom Middle English thryven, thriven, from Old Norse þrífa (“to seize, grasp, take hold, prosper”), from Proto-Germanic *þrībaną (“to seize, prosper”), from Proto-Indo-European *trep-, *terp- (“to satisfy, enjoy”). Cognate with Swedish trivas, Danish trives, Norwegian Bokmål trives.

Etymology from Wiktionary, CC BY-SA 3.0