asleep at the switch

Adjective

idiomatic

(idiomatic) Neglectful of an important task, responsibility, or opportunity.

Japanese Meaning

重要な任務や責任、または機会を怠る、または軽視する状態

The manager was asleep at the switch, and the project missed its deadline.

マネージャーは重要な職務を怠っていて、プロジェクトは締め切りに間に合わなかった。

Sense（1）

(idiomatic) Neglectful of an important task, responsibility, or opportunity.