go through (something) with a fine-tooth comb

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, go, through