Definition of "fourfold" []

• Four times as great (adjective)
• Quadruple (adjective)
• By a factor of four (adverb)

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• "To see things in fourfold is to open up an infinite world of possibilities."
• "Sometimes indeed their young warriors closed in with us, and were as often vanquished; but they never failed to repay us fourfold from a safe distance."
• "His campaign announced Friday that donations so far this week have totaled $1.6 million, described as a fourfold increase over the average take for an entire month."