へりくだる
へりくだる · herikudaru · JLPT N1 · noun
hearer
🙇 へり (edge) + くだる (go down) = step down to the edge, below the listener
へりくだる combines へり (edge, rim) and くだる (to descend). Humbling yourself means moving down to the edge so the listener sits higher. It is the core of formal Japanese self-deprecating politeness.