Nitpick definitions

nĭt'pĭk'
To be concerned with or find fault with insignificant details.
verb
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To criticize or find fault with (someone or something) in a petty way.
verb
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To find fault with (someone or something) in a manner that is finicky or petty.
verb
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To correct minutiae or find fault in unimportant details; to kvetch.

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

verb
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(archaic) To pick nits - lice eggs - from someone's hair.

Watch the mother gorilla nitpick the baby's fur clean.

verb
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Origin of nitpick

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