polish off

polish off idiom
Finish or dispose of, especially quickly and easily. For example, We polished off the pie in no time, or If everyone helps, we can polish off this job today. This usage, dating from the early 1800s, came from boxing, where it originally meant “to defeat an opponent quickly and easily.” By the 1830s it was used more generally.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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