expression
like peering into an abyss; as if standing on the edge of an abyss
A classical simile evoking the awe and danger of confronting a deep, unfathomable situation. Used in literary or formal contexts.
彼の目は深淵に臨むが如しで、何を考えているのか全く読めなかった。
His eyes were like peering into an abyss; I couldn't read his thoughts at all.
A classical Japanese expression combining 深淵 (abyss) with the simile marker 如し (like). The exact origin is uncertain, but it draws on the traditional metaphor of an abyss as something profound and dangerous.