go over/through something with a fine-tooth comb
US /ɡoʊ ˈoʊvər/θruː ˈsʌmˌθɪŋ wɪð ə faɪn-tuːθ koʊm/
UK /ɡoʊ ˈoʊvər/θruː ˈsʌmˌθɪŋ wɪð ə faɪn-tuːθ koʊm/

1.
綿密に調べる, 徹底的に調査する
to examine something very carefully, looking for mistakes or problems
:
•
The auditors will go over the accounts with a fine-tooth comb.
監査人は帳簿を綿密に調べるだろう。
•
We need to go through the contract with a fine-tooth comb before signing it.
署名する前に契約書を綿密に調べる必要がある。