tie the knot
To marry, wed, get married.
Rowena sacrificed her inclination to remain single, to her sense of duty; and contracted a second matrimonial engagement. […] Cardinal Pandulfo tied the knot for them.
noun
A knot; a fastening.
A knot of hair, as at the back of a wig.
A necktie (item of clothing consisting of a strip of cloth tied around the neck). See also bow tie, black tie.
A lace-up shoe.
Oxford ties; Derby ties
[…] the tip of her russet boot almost grazed that of his Oxford tie.
A twist tie, a piece of wire embedded in paper, strip of plastic with ratchets, or similar object which is wound around something and tightened.
verb
To twist (a string, rope, or the like) around itself securely.
Tie this rope in a knot for me, please.
Tie the rope to this tree.
To form (a knot or the like) in a string or the like.
Tie a knot in this rope for me, please.
To attach or fasten (one thing to another) by string or the like.
Tie him to the tree.
In bond of virtuous love together tied.
To secure (something) by string or the like.
Tie your shoes.
Not tied to rules of policy, you find / Revenge less sweet than a forgiving mind.
To have the same score or position as another in a competition or ordering.
They tied for third place.
They tied the game.