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.
revisar con lupa, examinar minuciosamente
to examine something very carefully, looking for mistakes or problems
:
•
The auditors will go over the accounts with a fine-tooth comb.
Los auditores revisarán las cuentas con lupa.
•
We need to go through the contract with a fine-tooth comb before signing it.
Necesitamos revisar el contrato con lupa antes de firmarlo.