troth /ˈtrɑθ, ˈtrɔθ, ˈtroθ, ||ð/
  真實,誠實,約定(vt.)約定,訂婚
  Troth n.
  1. Belief; faith; fidelity.
  Bid her alight
  And hertroth plight.   --Shak.
  2. Truth; verity; veracity; as, by my troth.
     In troth, thou art able to instruct gray hairs.   --Addison.
  3. Betrothal.
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  troth
       n 1: a mutual promise to marry [syn: betrothal, engagement]
       2: a solemn pledge of fidelity [syn: plight]