quadruple

v [I, Tn] become multiplied or multiply (sth) by four 变成四倍; 以四乘（某数）: Their profits have quadrupled/They have quadrupled their profits in ten years. 他们的利润十年中增长至四倍[他们使利润在十年中增长至四倍].

qty, qua, quack, quack-quack, quackery, quad, quadr(i)-, Quadragesima, quadrangle, quadrangular, quadrant, quadraphonic (also quadrophonic), quadraphony (also quadrophony), quadratic equation, quadrennial, quadrilateral, quadrille, quadrillion, quadrophonic, quadrophony, quadruped, quadruplet, quadruplicate, quaff, quagmire, quail, quaint, quaintly, quaintness, quake, Quaker, qualification, qualified, qualifier, qualify, qualitative, qualitatively, quality, qualm, quandary, quango,