The idiom 'Above Board' means if something is done above board, they are continued in a correct and proper manner.
It means honest and Legal.
The word Above Board is arrived from table card players, when they keep their hands above the board it means that they are playing very honestly.
1. The deal of the property was completely above board.
2. Ramesh bought a new car from a man he met in the club, but it was all above board.
3. Members want everything above board in the group discussion.