verb , adjective , determiner
■ verb
/ kwɒˈdruːpl; NAmE kwɑːˈd-/ to become four times bigger; to make sth four times bigger :
[ v ]
Sales have quadrupled in the last five years.
[also vn ]
■ adjective [ only before noun ] determiner / ˈkwɒdrʊpl; NAmE kwɑːˈdruːpl/
1.
consisting of four parts, people or groups :
a quadruple alliance
2.
being four times as much or as many :
a quadruple whisky
This year we produced quadruple the amount produced in 2002.
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WORD ORIGIN
late Middle English (as a verb): via French from Latin quadruplus , from quadru- four + -plus as in duplus (from duo two).