trothplight I. \ˈ ̷ ̷ˌ ̷ ̷\noun Etymology: Middle English trouth plight, from trouth troth + plight archaic: a solemn pledge usually to enter into the married estate II. transitive verb Etymology: Middle English trouth plighten, from trouth troth + plighten to pledge — more at plight archaic: betroth