Fine-tooth comb
Meaning: If you go through something with a fine-tooth comb, you examine it in great detail and with great care.
Example: We have gone through the evidence with a fine-tooth comb. We examined the figures with a fine-tooth comb but found no errors.
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Example: We have gone through the evidence with a fine-tooth comb. We examined the figures with a fine-tooth comb but found no errors.