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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." --Burke. [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]