Etymology
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aboveboard (adj.)

"in open sight, without trickery or disguise," 1610s, from above and board (n.1). "A figurative expression borrowed from gamesters, who, when they put their hands under the table, are changing their cards." [Johnson]

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Definitions of aboveboard
1
aboveboard (adv.)
in an honest manner;
was known for dealing aboveboard in everything
Synonyms: honestly
2
aboveboard (adj.)
without concealment or deception; honest;
their business was open and aboveboard
Synonyms: straightforward
From wordnet.princeton.edu