fine-toothed (adj.)youdaoicibaDictYouDict[fine-toothed 词源字典]
c. 1600, "epicurean, having delicate tastes," from fine (adj.) + toothed "having teeth" (of a certain kind); see tooth (n.). By 1703 as "having fine teeth" (of a saw, file, comb, etc.); fine-tooth in this sense attested from 1804.[fine-toothed etymology, fine-toothed origin, 英语词源]