◆開いた口へ牡丹餅 Aita-kuchi e botamochi.
- 解釈：努力も苦労もしないのに、向こうから幸運が舞い込んでくること。
- Literal：A botamochi falls into an opened mouth. The bean jam rice cake ([botamochi]) entered an open mouth.
- Interpretation：Unexpected piece of good luck. It became happy though it did not make an effort.
- 類義：大鴨（おおがも）が葱（ねぎ）を背負って舞い込む。棚から牡丹餅。寝耳に小判。