Definition of quadruple verb from the Oxford Advanced Learner's Dictionary

 

quadruple

 verb
verbVerb Forms present simple I / you / we / they quadruple
BrE BrE//kwɒˈdruːpl//
 
; NAmE NAmE//kwɑːˈdruːpl//
 
he / she / it quadruples
BrE BrE//kwɒˈdruːplz//
 
; NAmE NAmE//kwɑːˈdruːplz//
 
past simple quadrupled
BrE BrE//kwɒˈdruːpld//
 
; NAmE NAmE//kwɑːˈdruːpld//
 
past participle quadrupled
BrE BrE//kwɒˈdruːpld//
 
; NAmE NAmE//kwɑːˈdruːpld//
 
-ing form quadrupling
BrE BrE//kwɒˈdruːplɪŋ//
 
; NAmE NAmE//kwɑːˈdruːplɪŋ//
 
 
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BrE BrE//kwɒˈdruːpl//
 
; NAmE NAmE//kwɑːˈdruːpl//
 
[intransitive, transitive] quadruple (something) to become four times bigger; to make something four times bigger Sales have quadrupled in the last five years.
Word Origin late Middle English (as a verb): via French from Latin quadruplus, from quadru- ‘four’ + -plus as in duplus (from duo ‘two’).
See the Oxford Advanced American Dictionary entry: quadruple

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