The phrase "to tie the knot" means to get married. It is an idiom that comes from the traditional practice of tying a knot during a wedding ceremony, symbolizing the joining together of two people in marriage.
Sentences with «to tie the knot»
I moved in with him when we got engaged and we plan on tying the knot in a few months. (theeverygirl.com)
Care to meet a few who tied the knot with us? (hoteleventi.com)
There are so many things to consider before tying the knot. (thriveworks.com)