fine-tooth comb

fine-tooth comb idiom
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.

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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