student asking question

What is the role of "in" in "expert in the idea"?

teacher

Native speaker’s answer

Rebecca

The preposition "in" here is used to indicate relation to something. So "an expert in the idea" means that he is an expert involved in or related to this particular idea. Here's a few more examples of "in" in similar contexts: Ex: I got my degree in psychology. Ex: He's interested in sports.

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