what does "prime example" mean?

English as a Second Language English Vocabulary, Grammar and Idioms
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what does " prime example " mean?

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Hello Sultano,

A “prime example” is a “first-class” or “particularly pertinent” example. It is usually used when introducing or referring to an example during the course of a discussion or debate.

Thus speaker A may mention a particular case; and speaker B will say e.g.

  1. That’s a prime example of what I was talking about.

Best wishes,

MrP