The idiom "on one's watch" has its origins in naval and military terminology, particularly in the context of guarding or overseeing a specific period of time. A "watch" refers to a specific duty or shift during which a person is responsible for monitoring and ensuring the safety and security of a ship, base, or other area. This phrase is used to imply that someone is responsible for and should be held accountable for what occurs during a specific period of their responsibility or tenure.

What is the origin of the idiom "on one's watch" and when to use it?

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英語での「on one's watch」の定義と意味

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