Where does “くそ” come from?

くそ (Japanese) comes from Japanese こそ, from Old Japanese 此 — this.

くそ (Japanese): a suffix attached to a person's name; "second...

Definitions

  1. a suffix attached to a person's name; "second...

Ancestry of “くそ”, step by step

StepLanguageWordMeaning
1Japaneseこそemphatic particle used for emphasis: it is... that
2Old Japanese此this

Words derived from “くそ”

Every word from Old Japanese 此 →Every word from Japanese こそ →