tie the knot

tie the knot idiom
Get married; also, perform a marriage ceremony. For example, So when are you two going to tie the knot? or They asked their friend, who is a judge, to tie the knot. [Early 1700s]

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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