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have been mothballing

  • present perfect progressive
    of mothball.
    mothball
    noun
    a small ball of naphthalene or sometimes of camphor for placing in closets or other storage areas to repel moths from clothing, blankets, etc.

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At the same time, airlines have been mothballing many 50-seat regional jets, long the backbone of service at midsize airports.

From New York Times ● Sep. 5, 2011