on one's watch

Adverb

US idiomatic

(chiefly US, idiomatic) During the period of time when one is in a position of authority or responsibility.

Japanese Meaning

自分が権限や責任を持っている期間中に起こる事柄について、その期間内に起こったという意味。例えば、自分の担当時間内に発生したというニュアンス。

A major security breach happened on one's watch, and the board demanded answers.

重大なセキュリティ侵害がその人の在任中に発生し、取締役会は説明を求めた。

Sense（1）

(chiefly US, idiomatic) During the period of time when one is in a position of authority or responsibility.