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had been augmenting

  • past perfect progressive
    of augment.
    augment
    verb (used with object)
    to make larger; enlarge in size, number, strength, or extent; increase.

Example Sentences

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That was another source of dissatisfaction with King Angus of Gram; he had been augmenting his forces by hiring off-planet mercenaries.

From Space Viking by H. Beam Piper