quadruple
verb [ I or T ] uk/kwɒdˈruː.pəl/ us/kwɑːˈdruː.pəl/
（使）成四倍;（使）以四乘
to become four times as big, or to multiply a number or amount by four
The number of students at the college has quadrupled in the last ten years. 在过去10年内，该大学的学生人数增加了3倍。
We expect to quadruple our profits this year. 今年我们打算把利润翻两番。
quadruple
adjective, predeterminer uk/kwɒdˈruː.pəl/ us/kwɑːˈdruː.pəl/
大（或多）四倍
four times as big
a quadruple measure 四倍大小
We have had quadruple the number of applicants we expected. 申请人数是我们预计的4倍。
包括四部分（或四个人、四个地方等）的
involving four parts, people, places, etc.
a quadruple fracture of his thumb 他的拇指四处骨折