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.
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!
(hyphenated is used before a noun) Exactly right; perfectly accurate. Mr. Lynch's analysis of the company is spot on, if you ask me. I suggest we follow whatever advice he offers. Yes, those directions you gave me were spot on, thank you! Mark does a spot-on impression of our teacher—you have to hear it!
bang on someone or something
to strike someone or something repeatedly. (Especially to beat on a person or a drum.) Please stop banging on that drum! Max was banging on Lefty when the cops arrived.
bang onexactly right. British informal
spot oncompletely accurate or accurately. British informal
2007 Clarissa Dickson Wright Spilling the Beans She advised her solicitors to give the money to my mother for me, as she believed my father would fail to pass it on to me. She was spot on.