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double

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verb American English pronunciation: double /ˈdʌb(ə)l/ 
Word Forms
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present tense
I/you/we/theydouble
he/she/itdoubles
present participledoubling
past tensedoubled
past participledoubled
  1. 1
    [intransitive] to become twice as big, twice as much, or twice as many

    The number of people out of work has doubled in the last five years.

    double in size/amount/price etc.:

    Their house has doubled in value since they bought it.

    1. a.
      [transitive] to increase something so that it is twice as big, twice as much, or twice as many

      The government is threatening to double the tax on liquor.

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