tv. to marry a mate. : We tied the knot in a little chapel on the Arkansas border.
tv. [for a cleric] to unite a couple in marriage. : It was hard to find somebody to tie the knot at that hour.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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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]