tie the knot

(verb) get married

Example Sentences:

A: When do you plan to tie the knot?
B: Sometime after I find a boyfriend!

The happy young couple tied the knot under a beautiful sunset.

Rachel and Sean are planning on tying the knot in Hawaii.

From the Blogs:

tie the knot -- My Island Wedding

Media:

Similar idioms:

1. tie someone down
2. guidebook
3. penny-pincher
4. play it by ear