go over/through something with a fine-tooth comb

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go over (something) with a fine-tooth comb

To scrutinize something; to look at something very carefully. We need to go over these files with a fine-tooth comb to find that missing paperwork. Make sure to go over 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, over

go over/through something with a ˌfine-tooth ˈcomb

(informal) search or look at something very closely or carefully: I went through the accounts with a fine-tooth comb checking for mistakes.The police went through his room with a fine-tooth comb.
See also: comb, over, something, through