Longman Dictionary of Contemporary English homepage

mass

3 verb
     
mass3 [intransitive and transitive]
to come together, or to make people or things come together, in a large group [= gather]
mass (something) behind/along/in etc something
Western reports say that troops have been massing in the region since December.
grey clouds massing behind the mountains
Both countries have massed troops along the border.

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