fourfold
adjective
four·fold ˈfȯr-ˌfōld 
-ˈfōld
1
: being four times as great or as many
2
: having four units or members
fourfold
ˈfȯr-ˈfōld
adverb 
Example Sentences
There has been a fourfold increase in membership this year.
Recent Examples on the Web Brown counts his greatest achievement as president to be the fourfold increase in financial aid offered by the university and the rise in minority and first generation students at BU. 
Alexander Thompson, BostonGlobe.com, 7 Sep. 2022 Haft said their use increased more than fourfold since the beginning of the year. Erin Cox, Washington Post, 9 June 2022 Threats against members of Congress jumped more than fourfold after Mr. Trump took office. New York Times, 9 Feb. 2022 Oregon’s Higher Education Coordinating Commission unanimously approved a budget request Thursday that includes a fourfold increase in funding for financial aid grants for Oregon students. oregonlive, 11 Aug. 2022 Much of the senior population didn’t want to leave the neighborhood because of the fourfold increase since 2019 in hate crimes against people of Asian descent. Claudia Lauer, The Christian Science Monitor, 25 July 2022 New research suggests that cyberbullying increased the risk of adolescents experiencing suicidal thoughts fourfold, according to a paper published in the medical journal JAMA. Iain Martin, Forbes, 29 June 2022 Since the onset of the pandemic, 3M Co. increased its annual production of N95 masks fourfold to 2.5 billion by building extra capacity. Anne D'innocenzio, USA TODAY, 29 July 2021 The condition increases a person's risk of having an ischemic stroke by at least fourfold. Joe Carlson, Star Tribune, 24 June 2021 See More
Alexander Thompson, BostonGlobe.com, 7 Sep. 2022 Haft said their use increased more than fourfold since the beginning of the year. Erin Cox, Washington Post, 9 June 2022 Threats against members of Congress jumped more than fourfold after Mr. Trump took office. New York Times, 9 Feb. 2022 Oregon’s Higher Education Coordinating Commission unanimously approved a budget request Thursday that includes a fourfold increase in funding for financial aid grants for Oregon students. oregonlive, 11 Aug. 2022 Much of the senior population didn’t want to leave the neighborhood because of the fourfold increase since 2019 in hate crimes against people of Asian descent. Claudia Lauer, The Christian Science Monitor, 25 July 2022 New research suggests that cyberbullying increased the risk of adolescents experiencing suicidal thoughts fourfold, according to a paper published in the medical journal JAMA. Iain Martin, Forbes, 29 June 2022 Since the onset of the pandemic, 3M Co. increased its annual production of N95 masks fourfold to 2.5 billion by building extra capacity. Anne D'innocenzio, USA TODAY, 29 July 2021 The condition increases a person's risk of having an ischemic stroke by at least fourfold. Joe Carlson, Star Tribune, 24 June 2021 See More Word History
Etymology
Middle English, from Old English fēowerfeald, from fēower + -feald -fold
First Known Use
before the 12th century, in the meaning defined at sense 1
Kids Definition
fourfold
adjective
four·fold ˈfȯr-ˌfōld
: being four times as great or as many
a fourfold increase