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Longman Dictionary of Contemporary English
fine-tooth comb
noun
EXAMPLES FROM CORPUS
▪ I want to take a handful of good men and go over it with a fine-tooth comb.
▪ I went over it with a fine-tooth comb.
▪ Your lads have been over this place with a fine-tooth comb.
Wiktionary
fine-tooth comb

alt. A comb with fine, closely-spaced teeth. n. A comb with fine, closely-spaced teeth. vb. 1 To go over or through with a fine-tooth comb 2 To search meticulously.

WordNet
fine-tooth comb
  1. n. a comb with teeth set close together [syn: fine-toothed comb]

  2. a method of examining in minute detail; "he went over the contract with a fine-tooth comb looking for loopholes" [syn: fine-toothed comb]