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had been retarding

  • past perfect progressive
    of retard.
    retard
    verb (used with object)
    to make slow; delay the development or progress of (an action, process, etc.); hinder or impede.

Example Sentences

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After 1822, Neptune, in passing from E to D, had been retarding Uranus in his orbit from B to A. We have seen it is easy to miss immortality.

From Recreations in Astronomy With Directions for Practical Experiments and Telescopic Work by Henry White Warren