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1. To strike the keys of a piano loudly or clumsily while attempting to play a song. I think your sister is trying to bang out "Hot Cross Buns" on the piano. Whenever my neighbor is banging out something on his piano, you can hear it all the way down the street.
2. To complete a task quickly or hastily. I totally forgot that paper was due today, so I'm just going to bang out something to give the teacher next period.
bang something out
to play something on the piano, loudly, banging on the keys; to type something on a keyboard by pounding on the keys. Let me bang this melody out and see if you can guess who wrote it. Please bang out the school song good and loud. I banged out the newspaper story and just barely made my deadline.
Produce something loudly or hastily by striking, either a musical instrument or a typing keyboard. For example, The accompanist banged out the melody on the piano, or John planned to bang out his presentation in a couple of hours. [Late 1800s]
1. To write something very quickly, especially using a keyboard: Facing a deadline, the writer banged out an editorial for the paper. I need to reply to the bank right away; could you bang a letter out for me?
2. To play a piece of music very loudly, especially on a piano: I sat down and banged out some funny songs to entertain my friends. I think of this waltz as a quiet piece of music, but some players really bang it out.