a fine-tooth comb

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a fine-tooth comb

A phrase used to describe a way of doing something that is very careful and thorough. 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?
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Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

fine-tooth comb

A method of searching or investigating in minute detail, as in He examined the figures with a fine-tooth comb but found no errors. The practice of using a comb with close-set teeth to comb out head lice was transferred to various kinds of investigation in the late 1800s.
See also: comb
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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