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"double" is also used as a crossword clue. If that's what you saw, the answer is often twofold (7 letters).
Definitions
to double the degree
Word origin
From Middle English double, from Old French doble, double, from Latin duplus (“twofold”). Doublet of doppio and duple.
Used in a sentence
“The closet has double doors.”
“Give me a double serving of mashed potatoes.”
“Britain's population density used to be double that of China.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Two times as large”6 letters
02“Twofold”6 letters
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