The origin of the idiom "feather in one's cap" dates back to the medieval era, when knights and soldiers would wear feathers in their helmets as a symbol of their achievements in battle. The more feathers a knight had, the more successful they were considered to be. Today, the idiom is used to describe any accomplishment or success that is considered a source of pride or honor.

What is the origin of the idiom "feather in one's cap" and when to use it?

英語での「feather in one's cap」の定義と意味

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