say it: fawr-FOHLD
fourfold is an adjective and adverb meaning "four times as great or many". It carries 3 recorded senses.
having four units or components
“quadruple rhythm has four beats per measure”
“quadruplex wire”
by a factor of four
“the price of gasoline has increased fourfold over the past two years”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for fourfold come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.