fine-toothed comb

Noun fine-toothed comb has 2 senses

• fine-toothed comb(n = noun.artifact) fine-tooth comb - a comb with teeth set close together;
is a kind of comb

• fine-toothed comb(n = noun.act) fine-tooth comb - a method of examining in minute detail; "he went over the contract with a fine-tooth comb looking for loopholes"
is a kind of examination, scrutiny