1
general::
Phrase(s): tie the knot
1. Fig. to marry a mate. • We tied the knot in a little chapel on the Arkansas border. • They finally tied the knot. 2. Fig. [for a cleric or other authorized person] to unite a couple in marriage. • It was hard to find somebody to tie the knot at that hour. • It only took a few minutes for the ship’s captain to tie the knot.
McGrawhill's American Idioms And Phrasal Verbs
2
general::
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]
American Heritage Idioms