bang on
1. verb To strike something repeatedly. Quit banging on the door, I'm coming! How much longer will your little sister bang on the piano tonight? I'm getting a headache from all that racket. Oh brother, someone gave my kid a drum for his birthday, and he's been banging on it nonstop ever since.
2. adjective Exactly right. I think that is a bang on analysis of Forster's novel. My estimate was bang on. I hope the boss notices! Wow, that's bang on. How did you add all of that up that fast?
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