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3. go through (something) with a fine-tooth comb

go through (something) with a fine-tooth comb

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go through (something) with a fine-tooth comb

To scrutinize something; to look at something very carefully. We need to go through these files with a fine-tooth comb to find that missing paperwork. Make sure to go through your thesis with a fine-tooth comb before you hand it in—you don't want your advisors wading through proofreading errors, do you?

See also: comb