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is massing

  • present progressive
    of mass (3rd person singular).
    mass
    noun
    a body of coherent matter, usually of indefinite shape and often of considerable size.

Example Sentences

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U.S. intelligence, relying in part on satellite imagery, has found that Russia is massing forces around Ukraine in support of a potential multi-front incursion.

From Washington Post ● Jan. 29, 2022

Chinese internet photos posted online this week revealed that the People’s Liberation Army is massing missile forces in preparation for the upcoming Oct.

From Washington Times ● Aug. 14, 2019

Something is massing in the air, like thunder.

From The New Yorker ● Jul. 26, 2019

Napoleon is massing an army at Boulogne, ready to invade England.

From BBC ● Nov. 21, 2014

"The Kingslayer is massing a host at easterly Rock," Ser Rodrik Cassel answered from the room behindher.

From "A Game of Thrones" by George R.R. Martin