stand up with

stand up with idiom
Be the principal witness at a wedding, that is, act as best man or maid or matron of honor. For example, Jane asked her sister to stand up with her.

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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