Nitpick

//ˈnɪt.pɪk// verb

Definitions

Verb
  1. 1
    To correct insignificant mistakes or find fault in unimportant details. figuratively

    "Someone will invariably nitpick about any spelling error posted to the forums."

  2. 2
    be overly critical; criticize minor details wordnet
  3. 3
    To pick nits (lice eggs) from someone’s hair. archaic
  4. 4
    To pick nits (lice eggs) from someone’s hair. I nitpicked his hair.; I nitpicked his hair. archaic

Etymology

From nit + pick, originally referring to literally removing invisibly tiny louse eggs by hand.

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