Yanamino丁是丁，卯是卯
dīng shì dīng , mǎo shì mǎodingshiding,maoshimao
- lit. to keep ding (the fourth heavenly stem) distinct from mao (the fourth earthly branch) (idiom)
- fig. meticulous
- conscientious
- unambiguous
Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences