Go over it with a fine-toothed comb
Meaning 1
Check it very carefully & thoroughly
Context 1
“Ok once you get all the paperwork back you need to go over it with a fine-toothed comb and make sure we haven’t left anything that identifies people in any way, understand?”
Meaning 2
”
Context 2
“Look, I’ve been over it with a fine-toothed comb, there’s nothing wrong with it, it could just be the way you’re using it, can you show me?”
