0 past simple and past participle of quadruple
1 to become four times as big, or to multiply a number or amount by four:
From a thousand a week, the circulation quickly quadrupled, and before long was 20 times what it had been.
By this time, the number of people engaged in the skin trade more than quadrupled.
For example, between 1970 and 1980, the number of these groups more than quadrupled.
During the twentieth century the world's population quadrupled, the global economy expanded 14-fold, and industrial output expanded by a factor of 40.
In real terms, national public hospital expenses quadrupled between 1902 and 1930.
Furthermore, collective labor disputes also rose, as the number almost quadrupled between 1996 and 1999.
Between 1966 and 1971 the total aid budget quadrupled, but bilateral aid increased tenfold, thus opening the door wide for the advancement of trade issues in development policy.
Okra biomass tripled in the 4-week solarized treatment and quadrupled in the 6-week solarization treatment compared to the non-solarized treatments of the same duration.
