- past 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.
Russian troops, tanks and missile launchers had been massing in Belgorod, a Russian city just 90 minutes from the Ukrainian city’s center.
From Washington Post • Feb. 23, 2022
For weeks, he had been massing white-painted tanks, artillery, ski troops, cavalry, aircraft.
From Time Magazine Archive
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For weeks Tudjman's generals had been massing troops around Krajina, threatening to retake the breakaway province unless the Serbs agreed to rejoin Croatia.
From Time Magazine Archive
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On Tuesday, August 18, the German troops surged down upon Tirlemont, a town twenty miles southeast of Louvain, around which they had been massing for some days, presumably by rail and motor cars.
From America's War for Humanity by Russell, Thomas Herbert
If France had been massing troops on your frontier you would at once have asked her to state her intentions, or even possibly have taken action without asking her.
From Punch, or the London Charivari, Volume 153, December 26, 1917 by Various