with a fine-tooth comb

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with a fine-tooth comb

Very carefully and thoroughly. 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

with a fine-tooth comb

or

with a fine-toothed comb

If you examine something with a fine-tooth comb or with a fine-toothed comb, you examine each small part of it very carefully. I have been through Ed's personal papers and letters with a fine-tooth comb. We will scrutinise our mistakes with a fine-toothed comb. Note: A fine-tooth comb is a comb with very thin teeth set very close together. It is used to remove lice and nits (= small insects and their eggs) from people's hair.
See also: comb

with a fine-tooth comb

(of examination or analysis) extremely thorough and detailed.
A literal fine-tooth comb is one with narrow teeth that are close together.
2003 CNN This budget has been gone over with a fine-tooth comb, and they don't see where another $3 billion or $4 billion in saving is going to come from.
See also: comb