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had been bulking

  • past perfect progressive
    of bulk.
    bulk
    noun
    magnitude in three dimensions, especially great size or extent: a defensive tackle better known for his bulk than for his speed and agility.

Example Sentences

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He had been bulking up, building his strength by eating extraordinary amounts of bamboo.

From BBC Dec. 3, 2021

He had been bulking up by lifting weights and going through two-a-days since August, trying to make the school’s football B-team.

From Washington Post