betroth (someone or oneself) to (someone)
1. To arrange a marriage between two people. Is it true that Lady Edith's family really betrothed her to that horrid man?
2. To agree or vow to marry someone. A: "Why would Alice betroth herself to someone so disreputable?" B: Well, he does have money."
betroth someone to someone
to promise someone in marriage to someone else. The king betrothed his daughter to a prince from the neighboring kingdom. She betrothed herself to one of the peasant boys from the village.