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mass

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verb [intransitive] mass pronunciation in British English /mæs/ 
Word Forms
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present tense
I/you/we/theymass
he/she/itmasses
present participlemassing
past tensemassed
past participlemassed
  1. to come together and form a large group

    Troops are massing along the southern border.

    1. a.
      [transitive] to bring people together and make them form a large group

      More than 5,000 police were massed within two days.

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