To tie the knot is to get married. They tied the knot in June, about to tie the knot.
It is light-hearted and belongs to announcements rather than to ceremonies. Several old wedding customs really did involve tying cloth or hands, which is where it comes from.
1phrasetie the knotTo get married.
“They will tie the knot in a registry office next spring.”
tie the knot is a phrase.
Practised in Family & People