what is { Above board } ?
"There are no secret negotiations. Our dealings have always
been above board."

Question

what is { Above board } ?
"There are no secret negotiations.  Our dealings have always 
  been above board."

Answer

Yes, it means honest and open dealings.

As opposed to dealings "under the table"...

Answer

Hi... "Our deals have been always honest/clear/ legal"...

Answer

It means everything was legal, legitimate.

Answer

Open / exposed for everyone to see; not hidden; no one is trying to trick or deceive anyone if they do things above board.