Meaning of “fine-tooth comb” in the English Dictionary

british dictionary

"fine-tooth comb" in British English

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fine-tooth combnoun

uk /ˌfaɪn.tuːθ ˈkəʊm/ us /ˌfaɪn.tuːθ ˈkoʊm/
with a fine-tooth comb

If you go through something with a fine-tooth comb, you examine it in great detail and with great care:

We have gone through the evidence with a fine-tooth comb.

(Definition of “fine-tooth comb” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)