The expression "keep an eye on someone or something" is an idiomatic phrase that has its origins rooted in the idea of vigilant observation and have been used in English for many years. It is commonly employed to highlight the need for awareness or surveillance, especially when there is a concern for safety, security, or supervision.

What is the origin of the idiom "keep an eye on someone or something" and when to use it?

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to [keep] an eye on {sb/sth}

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英語での「 keep an eye on somebody or something 」の定義と意味

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