Meaning of -FOLD in English

-FOLD

suffix

(in adjectives and adverbs) multiplied by; having the number of parts mentioned :

to increase tenfold

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WORD ORIGIN

Old English -fald , -feald ; related to fold to bend something on itself .

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.