"Birdbrain" is an English insult that emerged in the early 20th century, based on the perception that birds have very small brains and therefore limited intelligence. The term metaphorically labels someone as silly, foolish, or lacking common sense, implying their thinking is lightweight or scatterbrained. It is used in informal, often playful or teasing speech in English-speaking countries, and is mildly derogatory—insulting a person's intelligence but usually not intended as deeply offensive.

What is the origin of the term "birdbrain" and how is it used?

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英語での「birdbrain」の定義と意味

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