Betroth (verb)

1. To give in marriage; to promise to marry (someone).
2. To pledge oneself to (someone).

Origin:

Middle english betreuten, from old english betrēowian; akin to old high german betriuwen to trust.

Examples:

1. He betrothed his daughter to a wealthy merchant.
2. They betrothed themselves to each other in a private ceremony.
3. The prince betrothed himself to the princess.
4. She betrothed herself to her childhood sweetheart.
5. He betrothed his son to a woman of noble birth.