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. 16 August 2018. <http://thesaurus.yourdictionary.com/betroth>.
betroth. (n.d.). Retrieved August 16th, 2018, from http://thesaurus.yourdictionary.com/betroth