Honest, transparent, and above suspicion; conducted openly without deception.
From 'above' + 'board' (table in gaming contexts); originated in 16th century card games where 'above board' meant keeping hands visible above the table surface to prevent cheating.
This phrase literally comes from card cheaters' tricks—keeping your hands above the table board meant you couldn't hide cards under it, so 'aboveboard' became our word for honest dealing.
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