Where does “したっけ” come from?

したっけ (Japanese) comes from Japanese っけ, from Japanese けり, from Old Japanese けり — auxiliary verb indicating past tense: -ed.

したっけ (Japanese): then, and so

Definitions

  1. then, and so

Ancestry of “したっけ”, step by step

したっけ traces back through two separate lines of ancestry.

via Japanese っけ

StepLanguageWordMeaning
1Japaneseっけagain?
2Japaneseけりindicating past tense: -ed
3Old Japaneseけりauxiliary verb indicating past tense: -ed

via Old Japanese した

StepLanguageWordMeaning
1Old Japaneseした—
2Translingual−A long signal, used to form Morse code text, together with. (a short signal)
Every word from Old Japanese けり →Every word from Japanese けり →Every word from Japanese っけ →
したっけ — Etymology, Origin & Word History | Etymology Explorer