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have been quickening

  • present perfect progressive
    of quicken.
    quicken
    verb (used with object)
    to make more rapid; accelerate; hasten.

Example Sentences

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There is no doubt that the experiences of mankind during the World War have been quickening development more than could have been expected in normal times.

From The League of Nations and its Problems Three Lectures by L. (Lassa) Oppenheim