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"Hit home" means "to be understood completely and have a strong effect".
Usage in a movie ("Little Fockers"):
- I really appreciate your including me on the school tour, Greg.
- Oh, Jack, you are a trusted advisor. I mean, your words hit home about a top-notch education, getting your financial house in order.
- That's it.
- It's all about the kids, right?
- That's it.
