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"fourfold" is also used as a crossword clue. If that's what you saw, the answer is often quadruple (9 letters).
Definitions
by a factor of four
Word origin
From Middle English fourfold, fourefold, from Old English fēowerfeald. Equivalent to four + -fold. Cognate with Dutch viervoud, Gothic 𐍆𐌹𐌳𐌿𐍂𐍆𐌰𐌻𐌸𐍃 (fidurfalþs).
Used in a sentence
“Most pupils have a fourfold object in studying a language; they wish to be able to read and write, to speak and to understand it.”
“And he shall restore the Lambe fourefold, because he did this thing, and because he had no pittie.”
“Our main application is to the classification of Poisson brackets on Fano fourfolds.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Quadruple”8 letters
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