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nitpick [nitpicked, nitpicking, nitpicks]▼(to correct minutiae or find fault)
verb
[UK: ˈnɪt.ˌpɪk] [US: ˈnɪt.ˌpɪk]

split hairs▼(to consider fine details)
verb
[UK: splɪt heəz] [US: ˈsplɪt ˈherz]