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had been niggling

  • past perfect progressive
    of niggle.
    niggle
    verb (used without object)
    to criticize, especially constantly or repeatedly, in a peevish or petty way; carp.

Example Sentences

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It was just something that had been niggling for a lot of the year and obviously the more you play on it, it's going to get a little bit worse each time.

From BBC May 28, 2012