The idiom "past master" originated in the context of various trade guilds and fraternities during the Middle Ages and the Renaissance. In these organizations, individuals progressed through a series of stages or degrees of skill and knowledge. When a person had achieved the highest degree or level of mastery, they were known as a "past master." This phrase recognized their experience, knowledge, and expertise within the guild or fraternity. This expression is used to describe someone who is highly skilled, experienced, or knowledgeable in a particular field or activity. It indicates a person who has achieved a level of expertise that goes beyond being merely competent; they are considered a true master in their domain.

What is the origin of the idiom "past master" and when to use it?

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英語での「past master」の定義と意味

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