have been quickening
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present perfect progressiveof quicken.present perfect progressive
Used to describe an action that began in the past, has continued continuously, and is still in progress.
quickenverb (used with object)to make more rapid; accelerate; hasten.
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.
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