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Related to thump out: thump down
1. To create some kind of rhythm, tune, or percussive beat by thumping (on something). A noun or pronoun can be used between "thump" and "out." Someone started thumping out a beat on an upturned bucket while Jeff improvised the words. I couldn't remember how the song went, so she thumped the rhythm out for me on the table.
2. To play a song (on some instrument with keys), especially in a very rough or informal manner. Someone ran over to the piano and started thumping out "Jingle Bells."
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
thump something out (on the piano)
to pound out music on a piano. Joel thumped a happy tune out on the piano. He thumped out a well-known tune.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.