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has been retarding

  • present perfect progressive
    of retard (3rd person singular).
    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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He knows his master’s proclivities, and believes that he has come across some curious and rare specimens, which take time to collect or examine, and this it is which has been retarding his return.

From Gaspar the Gaucho A Story of the Gran Chaco by F.C. Tilney