quadruplequad·ru·ple /ˈkwɒdrʊpəl, kwɒˈdruː-kwɑːˈdruː-/ verb [intransitiveI, transitiveT] to increase or make something increase by four timesPre-tax profits have more than quadrupled from £5 million to over £20 million.
OPEC quadrupled the price of oil.
We hope to quadruple production in two years.