"Tie the knot" is a common phrase used when referring to getting married, but it's always good to have some synonyms in order to keep conversations and writing more interesting. Some synonyms for "tie the knot" include "get hitched", "take the plunge", "become one", "exchange vows", "commit to each other", "unite in marriage", "enter into matrimony", "join in wedlock", "pledge your love", "celebrate your union", and "make it official". These different phrases provide a variety of ways to express the act of getting married and can be used to add some creativity to any conversation or wedding-related writing.