Wiktionary
above-board
a. In open sight; without trick, concealment, or deception. (First attested in the late 16th century.)(R:SOED5: page=7) adv. Honestly; openly. (First attested in the late 16th century.)
Usage examples of "above-board".
There were traces of gold about, of course, and furnaces to heat up to two thousand degrees and so forth, but after all Goldfinger was a jeweller and a smelter in a small way, and all this was perfectly above-board.