Source : Webster's Revised Unabridged Dictionary (1913)

Tryst \Tryst\, n. [OE. trist, tryst, a variant of trust; cf.
   Icel. treysta to make trusty, fr. traust confidence,
   security. See {Trust}, n.]
   1. Trust. [Obs.]

   2. An appointment to meet; also, an appointed place or time
      of meeting; as, to keep tryst; to break tryst. [Scot. or
      Poetic]

   {To bide tryst}, to wait, at the appointed time, for one with
      whom a tryst or engagement is made; to keep an engagement
      or appointment.

            The tenderest-hearted maid That ever bided tryst at
            village stile.                        --Tennyson.