The idiom "up one's alley" originated from the literal notion of a person being in their familiar or preferred environment. The phrase is mainly used to signify something that is well-suited to a person's interests, skills, or expertise. In other words, it is used to suggests a strong affinity or compatibility between an individual and a particular subject, activity, or situation, implying that it falls within their area of knowledge or specialization.

英語での「up one's alley」の定義と意味

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