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Verb: niggle  ni-gul
  1. Worry unnecessarily or excessively
    "don't niggle too much over the grandchildren--they are quite big now";
    - fuss, fret
  2. Argue over petty things
    "Let's not niggle over pennies";
    - quibble, pettifog, bicker, squabble, brabble

Derived forms: niggled, niggling, niggles

Type of: argue, contend, debate, fence, sweat [N. Amer, informal], worry

Encyclopedia: Niggle