There are several synonyms for the phrase "be joined in marriage/holy matrimony." These include getting married, tying the knot, walking down the aisle, exchanging vows, taking the plunge, saying "I do," becoming husband and wife, matrimony, wedlock, and nuptials. All of these phrases indicate the same thing, the union of two people in a committed, lifelong relationship. Whether you choose to say "I do" or "take the plunge," the act of getting married is a momentous occasion filled with love, joy, and hope for the future. These synonyms provide a wide range of options for expressing the celebration of two lives coming together as one.