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Related to bash up: bash out
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To strike and dent or damage something. That shopping cart really bashed up the door of my car.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
bash something up
to crash something; to strike something and damage it. She bashed the car up badly. How did she bash up the car?
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.