hold one's end up

hold one's end up idiom
Also, keep one's end up. Do one's share. For example, John always holds his end up, but Jerry is less reliable, or Let's hope she can keep up her end. In these expressions end alludes to one of two sides of something that must be lifted by two persons. [Mid-1900s]

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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