Quadruple/kwɑːˈdruːpl/ Definition 1 of 3Pro Tip 1/2Dramatic Growth Used to emphasize a large increase, often in business or personal achievements. After the product launch, our sales quadrupled. Pro Tip 2/2Speed of Increase Implies a rapid change, not just a gradual growth, when something quadruples. Her social media followers quadrupled in just two months.