From The Collaborative International Dictionary of English v.0.48:

Aboveboard \A*bove"board`\, adv.
   Above the board or table. Hence: in open sight; without
   trick, concealment, or deception. "Fair and aboveboard."
   [1913 Webster]

   Note: This expression is said by Johnson to have been
         borrowed from gamesters, who, when they change their
         cards, put their hands under the table.
         [1913 Webster]
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