Definition of quadruple verb from the Oxford Advanced American Dictionary

 

quadruple

 verb
verb
NAmE//kwɑˈdrupl//
 
[intransitive, transitive]quadruple (something)Verb Forms present simple I / you / we / they quadruple
 
he / she / it quadruples
 
past simple quadrupled
 
-ing form quadrupling
 
 
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to become four times bigger; to make something four times bigger Sales have quadrupled in the last five years.
See the Oxford Advanced Learner's Dictionary entry: quadruple

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