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have been massing
  • present perfect progressive of mass.

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Thousands of Chinese fishing boats have been massing in geometric formations in the East China Sea, in coordinated actions that experts believe are part of Beijing's preparations for a potential regional crisis or conflict.

From Barron's • Mar. 13, 2026

Migrants have been massing in Mexico near various parts of the border with the United States - many of them unsure about when, or how, to cross.

From Reuters • May 11, 2023

The changes were welcomed by some, particularly leaders in cities where migrants have been massing.

From Seattle Times • Jan. 8, 2023

President Biden and Russian President Vladimir Putin spoke Thursday in a 50-minute phone call about the rising tensions between the two countries over Ukraine, where Russian troops have been massing near the border.

From Washington Times • Dec. 30, 2021

They have been massing their men for days.

From Harley Greenoak's Charge by Mitford, Bertram