to be excessively concerned with or critical of inconsequential details.
to criticize by focusing on inconsequential details.
a carping, petty criticism.
Also nit·pick·y . of, relating to, or characteristic of a person who nitpicks: a nitpick review of the miniseries.
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British Dictionary definitions for nit-pick
informal to raise petty objections or concern oneself with insignificant details
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012