An Encylopedia Britannica Company

fine–tooth comb

fine–tooth comb /ˈfaɪnˌtuːθ-/ noun
plural fine–tooth combs
fine–tooth comb
/ˈfaɪnˌtuːθ-/
noun
plural fine–tooth combs
Britannica Dictionary definition of FINE–TOOTH COMB
[count]
: a comb with many small teeth

go over/through (something) with a fine-tooth comb

: to examine something very closely