Where does “切歯” come from?

切歯 (Japanese) comes from Japanese 歯, from Middle Chinese 齒.

Ancestry of “切歯”, step by step

切歯 traces back through two separate lines of ancestry.

via Japanese 歯

StepLanguageWordMeaning
1Japanese歯tooth; age
2Middle Chinese齒—

via Japanese 切

StepLanguageWordMeaning
1Japanese切cut, sever; cutting; to cut
Every word from Middle Chinese 齒 →Every word from Japanese 歯 →