Longman Dictionary of Contemporary English homepage

quadruple

1 verb
     
quad‧ru‧ple1 [intransitive and transitive]
B to increase and become four times as big or as high, or to make something increase in this way [↪ double, triple]:
Food prices quadrupled during the war.
The company has quadrupled its profits in just three years.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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