The origin of the idiom "eagle eye" can be traced back to the natural characteristics and abilities of eagles. Eagles are known for their exceptional eyesight, which allows them to spot prey from great distances. The phrase "eagle eye" likely emerged as a metaphorical expression to describe someone who possesses a similar level of keen observation, attentiveness, or visual acuity. The comparison to an eagle's sharp vision emphasizes the person's ability to notice even the slightest details and be highly perceptive. While the specific origin of the idiom is unclear, it has become a commonly used expression in English language usage.

英語での「eagle eye」の定義と意味

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