The idiom "a flea in one's ear" likely originated from the irritating and distracting nature of fleas. In this metaphorical expression, having "a flea in one's ear" conveys the idea of receiving an unwelcome or bothersome piece of information, advice, or criticism. The discomfort associated with a flea buzzing around one's ear parallels the annoyance or disturbance caused by unexpected or unwanted input. The idiom is often used to describe a surprising revelation, an unexpected challenge, or an annoying comment.

英語での「a flea in one's ear 」の定義と意味

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