The idiom "in someone's wheelhouse" means that something is within a person's area of expertise or interest. It comes from baseball, where the "wheelhouse" refers to the part of the strike zone where a batter can hit the ball the best.
For example, if someone is a great cook, you could say that cooking is in their wheelhouse. Or if someone is a skilled writer, you could say that writing is in their wheelhouse.
You can use this idiom in a variety of situations, such as in job interviews, when discussing hobbies or interests, or when talking about someone's skills or talents. It's a casual expression, so it's best used in informal conversations rather than in professional or academic settings.
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