The phrase "swelled head" originated in the early 19th century and draws upon the image of a literal swelling or enlargement of the head, representing an inflated ego. It is used informally to describe someone who is arrogant and has an inflated sense of self-importance, often disregarding others' opinions or contributions.

What is the origin of the idiom "swelled head" and when to use it?

英語での「swelled head」の定義と意味

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