there·to /ðærˈtu, ðɛr-/
  (ad.)對那,往那邊,到那
  There·to adv.
  1. To that or this.
  2. Besides; moreover. [Obs.]
     Her mouth full small, and thereto soft and red.   --Chaucer.
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  thereto
       adv : to that; "with all the appurtenances fitting thereto" [syn:
             to it, to that]