The word "be-troth" means to enter into a formal engagement to marry. Some antonyms for this word could be: divorce, separate, estrange, break-up, disengage, or dissolve. These words represent the opposite of the commitment and union that is implied by "be-troth." It is important to note that while these antonyms relate to the end of a relationship or commitment, they do not necessarily imply the end of love or affection between two people. It is possible to separate or dissolve a formal engagement or commitment without losing the connection between two people.