◆石に錠　Ishi ni jou.
  • 解釈：用心に用心を重ねること。
  • Literal：It is a lock to a stone.
  • Interpretation：He is extremely careful. It is infallible.
  • 類義：石に判。石の証文、岩の判。
GLN 日本の諺・金言・名言　A proverb, a maxim, and a wise saying of Japan.