Informal to find fault with (someone or something) in a manner that is finicky or petty
Origin of nitpickback-formation ; from nit-picking
verbnit·picked, nit·pick·ing, nit·picks
To be concerned with or find fault with insignificant details. See Synonyms at quibble.
To criticize or find fault with (someone or something) in a petty way.
(third-person singular simple present nitpicks, present participle nitpicking, simple past and past participle nitpicked)