fourfold
four-fold
adjective
Being four times as much or as many; having four parts.
"They reported a fourfold increase in sales."
adverb
By four times the amount or number; to four times the extent.
"The company's profits grew fourfold last year."
Thesaurus
Synonyms: four times, multiple, quadruple, four-fold, quadruplicate, quadruplex