publish the banns, become engaged, bestow one's hand, give one's hand, contract, pledge, promise, precontract, plight faith, plight troth, bind, engage, affiance, commit oneself to, undertake to marry, espouse.
"betroth." YourDictionary, n.d. Web. 17 June 2018. <http://thesaurus.yourdictionary.com/betroth>.
betroth. (n.d.). Retrieved June 17th, 2018, from http://thesaurus.yourdictionary.com/betroth