fourfold

/ˌfɔrˈfoʊld/

If your salary increases fourfold when you get a new job, it means that your income is four times larger than it used to be.

Use the adjective fourfold when something is four times as big, or when it's been multiplied by four. You're almost always going to see fourfold accompanied by the word increase. For example, making class sizes smaller and school days longer might result in a fourfold increase in test scores. Or sticking to your pledge of not buying fancy coffee drinks could lead to a fourfold increase in available pocket change each week.

Definitions of fourfold

1. adjective

   four times as great or many
   “a fourfold increase in the dosage”

   synonyms: four-fold, quadruple

   multiple

   having or involving or consisting of more than one part or entity or individual
2. adjective

   having four units or components
   synonyms: four-fold, quadruple, quadruplex, quadruplicate

   multiple

   having or involving or consisting of more than one part or entity or individual
3. adverb

   by a factor of four
   “the price of gasoline has increased fourfold over the past two years”

   synonyms: four times