fine-tooth comb in French
fine-tooth comb in French
peigne fin
A comb with fine, closely spaced teeth, especially one used for removing head lice and their nits (eggs) from the hair; a nit comb.
passer au peigne fin
(figuratively) To search (something or somewhere) meticulously.
ratisser
(figuratively) To search (something or somewhere) meticulously.
passer au crible
(figuratively) To search (something or somewhere) meticulously.