Where does “ねずみ算式に増える” come from?

ねずみ算式に増える (Japanese) comes from Japanese ねずみ算, from Japanese 算.

ねずみ算式に増える (Japanese): to increase rapidly or exponentially; to grow like rabbits breeding of bad thing

Definitions

  1. to increase rapidly or exponentially; to grow like rabbits breeding of bad thing

Ancestry of “ねずみ算式に増える”, step by step

ねずみ算式に増える traces back through two separate lines of ancestry.

via Japanese ねずみ算

StepLanguageWordMeaning
1Japaneseねずみ算exponential growth
2Japanese算—

via Japanese 式

StepLanguageWordMeaning
1Japanese式type, style; formula; ceremony, ritual, function
Every word from Japanese 算 →Every word from Japanese ねずみ算 →
ねずみ算式に増える — Etymology, Origin & Word History | Etymology Explorer